Open access peer-reviewed chapter

Sheep Migration Patterns and Behavioral Adaptations in Indian Grazing Lands: Understanding Stress Factors and Environmental Adaptation

Written By

Vinod Bhateshwar, Basant Kumar Bhinchhar, Hitesh Muwal and Paramveer Palriya

Submitted: 02 July 2024 Reviewed: 16 July 2024 Published: 28 May 2025

DOI: 10.5772/intechopen.1006263

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Abstract

Sheep play a crucial role in India’s pastoral economy, navigating vast grazing lands through complex migration patterns shaped by diverse environmental stressors such as temperature extremes, forage variability, and predation risks. GPS tracking and behavioral observations reveal that these animals employ adaptive strategies such as social cohesion, herd dynamics, and individual learning to mitigate these challenges and optimize resource use. Sheep display flexible foraging behaviors and selective grazing, adjusting to fluctuating conditions. Stress markers, like cortisol levels, further highlight the impact of these environmental factors on sheep well-being and resilience. This study integrates ecological and ethological perspectives to explore how environmental stressors influence migration patterns and behavioral adaptations among sheep populations in India. The findings emphasize the importance of understanding these dynamics for sustainable pastoral management and conservation efforts. By uncovering the mechanisms of stress resilience and adaptation, the research offers valuable insights into the ecological functioning of grazing ecosystems. It informs strategies to protect sheep welfare and pastoral livelihoods in the face of environmental change.

Keywords

  • behavioral adaptations
  • grazing lands
  • India
  • sheep migration
  • stress

1. Introduction

Sheep migration patterns and behavioral adaptations play a crucial role in their survival and productivity within Indian grazing lands [1]. India’s diverse topography, ranging from the Himalayan foothills to the vast plains and coastal regions, offers a variety of habitats for sheep populations to thrive [2]. Understanding the intricacies of their migration patterns and behavioral adaptations is essential for comprehending their responses to stress factors and environmental changes. Sheep, primarily raised for wool and meat production, exhibit complex migration behaviors influenced by factors such as food availability, climatic variations, and human activities [3]. In India, where a significant portion of sheep husbandry occurs in extensive grazing systems, the movement of flocks across different landscapes is a common sight [4]. These migration patterns not only are driven by the search for adequate forage but also serve as a means to regulate exposure to environmental stressors.

The behavioral adaptations of sheep further enhance their resilience to the challenges posed by their environment. From flock dynamics to individual responses, these adaptations reflect a fine-tuned balance between survival instincts and learned behaviors [5]. For instance, sheep exhibit hierarchical structures within their flocks, where dominant individuals often lead the group to preferred grazing areas while subordinate members follow [6]. Such social dynamics help in efficient foraging and protection against predators. Moreover, sheep display remarkable physiological adaptations to cope with environmental stressors [7]. Their ability to conserve water in arid regions, tolerance to temperature fluctuations, and capacity to digest a wide range of vegetation highlights their evolutionary flexibility [8]. Additionally, sheep demonstrate behavioral plasticity, adjusting their grazing strategies in response to changing environmental conditions. For example, they may exhibit crepuscular grazing behavior, feeding during the cooler hours of dawn and dusk to avoid midday heat stress [9]. However, despite these adaptations, sheep populations in India face numerous stress factors that challenge their survival and productivity. Anthropogenic activities such as habitat degradation, competition for resources with other livestock species, and encroachment of grazing lands further exacerbate these challenges [10]. Understanding the interplay between migration patterns, behavioral adaptations, and stress factors is crucial for devising sustainable management strategies to ensure the welfare of sheep populations and the ecosystems they inhabit.

In this chapter, we aim to explore the intricate relationship between sheep migration patterns, behavioral adaptations, and environmental stress factors in Indian grazing lands. By synthesizing existing literature and empirical evidence, we seek to provide insights into the mechanisms driving sheep behavior and their responses to environmental changes. Ultimately, this understanding will contribute to the development of informed conservation and management practices that promote the resilience and sustainability of sheep populations in India’s diverse landscapes.

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2. Methodology

This chapter examines methodologies for studying sheep migration patterns and behavioral adaptations in Indian grazing lands using online data collection methods. Researchers utilize online surveys and virtual interviews with shepherds and farmers via digital platforms to gather qualitative insights on migration patterns and grazing practices. Remote sensing and satellite imagery, accessed through tools like Google Earth Engine, monitor grazing areas, and environmental conditions climate data from sources such as NASA’s Earth data and NOAA are used to correlate environmental factors with sheep behavior, while social media and this approach offers a comprehensive framework for understanding stress factors and adaptive strategies in sheep, contributing to sustainable grazing practices and improved animal welfare.

2.1 Sheep migration patterns in India

Sheep migration patterns in India can vary depending on climate, geography, and human activity. Generally, migrations often follow seasonal patterns in regions where sheep herding is common. Here is an overview:

2.1.1 Himalayan region

Sheep herding is a traditional practice in the Himalayan region, particularly in states like Himachal Pradesh, Uttarakhand, and Jammu & Kashmir. During the summer months, shepherds move their flocks to high-altitude grazing lands as the lower regions become too hot [11]. This migration pattern, known as transhumance, allows sheep to graze on fresh vegetation in the alpine meadows. The migration pattern of sheep in the Himalayan region can vary depending on factors such as climate, availability of pasture, and traditional herding practices of the local communities [12]. However, there are some general trends observed:

2.1.1.1 Seasonal migration

Sheep in the Himalayan region often engage in seasonal migration, moving to higher altitudes during the summer months and descending to lower elevations during the winter [13]. This migration pattern is influenced by the availability of fresh pasture at higher elevations during the warmer months and the need to avoid harsh winter conditions at lower altitudes.

2.1.1.2 Altitudinal migration

In mountainous regions like the Himalayas, sheep may migrate vertically, moving between different altitudinal zones in search of suitable grazing areas [14]. They may ascend to alpine meadows and high pastures during the summer and descend to lower slopes or valleys in the winter.

Transhumance: Transhumance is a traditional practice of seasonal movement of livestock between fixed summer and winter pastures [15]. In the Himalayan region, transhumance is common among pastoral communities that follow a seminomadic lifestyle. These communities may move their sheep along established migration routes, taking advantage of the available resources at different times of the year [11].

2.1.1.3 Herding practices

The migration pattern of sheep in the Himalayan region is often guided by herders who know the local terrain and grazing areas [16]. Herders may lead their flocks along well-established routes, which may have been used for generations.

2.1.1.4 Environmental factors

Environmental factors such as snowfall, rainfall, and the condition of grazing lands can also influence the migration pattern of sheep [17]. Unpredictable weather patterns or natural disasters like avalanches may alter migration routes or timing [18].

2.1.1.5 Conservation concerns

Human activities, including infrastructure development, deforestation, and overgrazing, can disrupt traditional migration patterns and impact the availability of grazing lands for sheep [19]. Conservation efforts often aim to preserve these migratory routes and maintain the ecological balance of the Himalayan region [20]. Overall, the migration pattern of sheep in the Himalayan region is a complex interplay of ecological, cultural, and economic factors, shaped by centuries of coexistence between humans and livestock in these rugged landscapes.

2.1.2 Rajasthan and Gujarat

In the western desert regions of Rajasthan and parts of Gujarat, sheep herding communities, such as the Rabari and Bharvad tribes, practice nomadic pastoralism. Their migration patterns are influenced by the availability of water and forage. During the dry season, they move to areas where water sources are more reliable and vegetation is still available [21]. The migration pattern of sheep in Rajasthan and Gujarat is primarily influenced by the availability of grazing lands, water sources, and seasonal climate changes. In these regions, especially in arid and semiarid areas, sheep herding is a traditional occupation, and many communities depend on it for their livelihood [22]. During the dry season, which typically lasts from October to June, sheep herders move their flocks to areas with better grazing opportunities and access to water [23]. They often travel long distances in search of suitable pastures and water sources. This movement is essential to ensure that the sheep have enough food and water to sustain themselves during the harsh conditions of the dry season.

In Rajasthan, for example (Figure 1), sheep herders often migrate to regions such as the Thar Desert and the Aravalli Range during the dry season [24]. These areas offer some vegetation even during the dry months, and herders may rely on wells or other water sources to provide for their flocks. Similarly, in Gujarat, sheep herders migrate to regions such as the Rann of Kutch and the Gir forest during the dry season. These areas have grasslands and scrub vegetation that can support grazing, and herders may also utilize water sources such as rivers or artificial ponds. During the monsoon season, which typically lasts from July to September, the migration pattern may reverse as herders return to their home villages or settlements. The availability of rainwater and the regeneration of pastures during this time provided sufficient resources for the sheep closer to their home bases [25]. Overall, the migration pattern of sheep in Rajasthan and Gujarat is a cyclical process that allows herders to optimize the use of available resources and ensure the well-being of their flocks throughout the year.

Figure 1.

Sheep herders migrate to regions such as the Aravalli range during the dry season. Source: Developed by the author Dr. Vinod Bhateshwar.

2.1.3 Central India

In states like Maharashtra, Madhya Pradesh, and Chhattisgarh, where there are vast grasslands and agricultural areas, sheep herding is also practiced. Here, migrations may not be as pronounced as in the Himalayas or desert regions, but shepherds may still move their flocks in search of better grazing lands, especially during the monsoon season when grasslands are more abundant. Sheep migration patterns in Central India can vary depending on factors such as seasonal changes, availability of grazing areas, and human activity [26]. However, there is not a standardized migration pattern for sheep in Central India as there might be in regions where transhumance (seasonal movement of livestock) is more common.

In general, sheep in Central India may move in search of suitable grazing grounds and water sources, especially during dry seasons when pastures become scarce. They might migrate to higher elevations during hotter months to escape the heat and descend to lower areas during colder months for better forage [3]. Local herding practices, land use patterns, and environmental conditions play significant roles in shaping these migration patterns. Additionally, factors like agricultural activities, urbanization, and the presence of predators can also influence the movement of sheep herds in the region. The dynamic nature of sheep migration in Central India, it would be beneficial to consult with local shepherds, livestock experts, or research studies for more specific information about particular areas and seasons.

2.1.4 Coastal regions

Coastal areas such as parts of Karnataka, Kerala, and Tamil Nadu also have sheep herding communities. These communities may not have extensive migration patterns like those in the Himalayas or deserts, but they may move their flocks within coastal areas based on seasonal changes in vegetation and weather patterns.

2.1.5 Human influence

In recent years, urbanization, land development, and changes in land use have impacted traditional sheep migration routes in many parts of India [27]. As a result, some migration patterns may have become more restricted or altered.

Human influence can have significant effects on sheep migration in India. Here are some factors to consider:

2.1.5.1 Habitat loss and fragmentation

Human activities such as agriculture, urbanization, and infrastructure development can lead to the loss and fragmentation of natural habitats for sheep [28]. This can disrupt traditional migration routes and force sheep to alter their movements or inhabit suboptimal habitats.

2.1.5.2 Fencing and barriers

The construction of fences, roads, and other barriers can impede the natural movement of sheep herds [28]. These barriers can disrupt migration patterns, isolate populations, and lead to conflicts with humans when sheep attempt to navigate around them.

2.1.5.3 Land use changes

Changes in land use patterns, such as the conversion of grasslands to croplands or urban areas, can reduce available grazing areas for sheep [29]. This can force them to migrate longer distances in search of suitable forage, leading to increased competition with other wildlife or domestic livestock.

2.1.5.4 Human-wildlife conflict

As human populations expand into sheep habitats, conflicts between humans and sheep can arise [30]. This may result in retaliatory killings of sheep by farmers or shepherds, especially if sheep damage crops or compete with livestock for resources.

2.1.5.5 Climate change

While not directly caused by humans, climate change, largely driven by human activities, can significantly impact sheep migration patterns. Changes in temperature, precipitation patterns, and the availability of water and forage can alter the timing and routes of sheep migrations, leading to challenges in adaptation for both sheep and the communities that depend on them [31].

2.1.5.6 Overgrazing and resource depletion

Unregulated grazing by domestic livestock, including sheep, can lead to overgrazing and depletion of vegetation in certain areas [32]. This can disrupt natural ecosystems, reduce biodiversity, and exacerbate soil erosion and desertification, affecting both sheep migration patterns and the overall health of the landscape [33].

Addressing these issues requires a holistic approach that considers the needs of both humans and wildlife. It involves sustainable land management practices, conservation efforts to preserve critical habitats, community-based natural resource management initiatives, and policies that promote coexistence between humans and wildlife. By mitigating human impacts and promoting sustainable practices, we can help ensure the long-term viability of sheep migrations in India and the ecosystems they inhabit.

2.2 Behavioral adaptations

Migration can significantly impact the behavioral adaptations of sheep in India, especially considering the diverse environments and cultural practices across the country. Here are some potential effects:

2.2.1 Forced migration and stress

In regions where forced migration is due to environmental factors like drought or flooding, sheep may experience heightened stress levels. This can lead to changes in their behavior, such as increased aggression or fearfulness [4]. Forced migration and stress can have significant effects on sheep behavior, as they do in many other animal species. Sheep are social animals, and forced migration can disrupt their social structures [6]. When groups are forcibly moved or combined with other groups, it can lead to conflicts as they establish new hierarchies and territories. Stress can exacerbate these conflicts, leading to aggressive behaviors within the flock [34].

Sheep may become more aggressive or fearful when exposed to stressors associated with forced migration (Figure 2). This can manifest as increased aggression toward other sheep or humans, or as heightened vigilance and fearfulness in response to perceived threats. Stress can affect sheep’s appetite and feeding behavior. Forced migration may disrupt their access to familiar grazing areas or food sources, leading to reduced feeding and weight loss [4]. Additionally, stressed sheep may exhibit decreased interest in feeding or spend less time grazing due to heightened anxiety or discomfort. Stress can impact reproductive behaviors in sheep, including mating and maternal care [35]. Forced migration may disrupt breeding cycles or cause ewes to exhibit decreased receptivity to rams. In pregnant ewes, stress can increase the risk of pregnancy loss or result in reduced maternal care behaviors toward offspring [36]. Forced migration can disrupt sheep’s natural movement patterns and migration routes. Stressed sheep may exhibit erratic or aimless movement behaviors as they attempt to cope with the stress of the migration process [37]. This can result in disorganized flock movement and difficulty in navigating unfamiliar terrain.

Figure 2.

The flock of sheep was exposed to stressors associated with long-distance forced migration. Source: Developed by the author Dr. Vinod Bhateshwar.

Stress weakens the immune system, making sheep more susceptible to diseases and infections [38]. Forced migration can expose sheep to new pathogens or environmental stressors, further compromising their health and increasing the risk of disease outbreaks within the flock [31]. The effects of forced migration and stress on sheep behavior may persist beyond the immediate migration period. Chronic stress can lead to long-term changes in behavior, including altered stress responses, increased fearfulness, and reduced resilience to future stressors [39].

Overall, forced migration and stress can have multifaceted effects on sheep behavior, influencing social dynamics, feeding and grazing behavior, reproductive patterns, movement patterns, susceptibility to disease, and long-term behavioral outcomes. Proper management practices and measures to minimize stress can help mitigate these effects and promote the welfare of migrating sheep populations.

2.2.1.1 Adaptation to climate

Sheep migration can have both positive and negative effects on adaptation to climate, depending on various factors such as the specific characteristics of the migration, the local ecosystem, and management practices [40]. Sheep that migrate to higher altitudes during the summer to escape the heat in the plains may exhibit behavioral adaptations such as seeking cooler areas during the day and grazing at night [41]. They may also develop a higher tolerance for cold temperatures. Sheep migration can lead to more efficient utilization of pasture resources, allowing areas to recover and regenerate, which can enhance ecosystem resilience to climate variations [42]. Migration may expose sheep to a wider variety of forage types, which can promote better nutrition and resilience to environmental changes. Through migration, sheep populations may encounter diverse environmental conditions, which can drive natural selection for traits that enhance adaptation to local climates [43].

However, uncontrolled or poorly managed migration can lead to overgrazing in certain areas, exacerbating soil erosion, reducing vegetation cover, and degrading habitats [33]. This can hinder ecosystem adaptation to climate change. Migration can facilitate the spread of diseases between sheep populations, especially if they move between areas with different disease pressures [44]. Climate change may also alter disease dynamics, potentially increasing the risk of transmission. In some cases, sheep migration routes may overlap with habitats of native wildlife. This can lead to competition for resources and disrupt natural ecosystems, affecting the ability of native species to adapt to changing climates.

In management strategies implementing rotational or managed grazing practices can help mitigate the negative impacts of overgrazing associated with migration. Regular monitoring of sheep health, combined with appropriate disease prevention and control measures, can help minimize the spread of diseases during migration [45]. Restoration efforts in areas impacted by overgrazing can enhance ecosystem resilience and support adaptation to climate change. Engaging with local communities, landowners, and stakeholders to develop collaborative management plans for sheep migration can help balance the needs of both human communities and natural ecosystems [46]. The various factors related to sheep migration and their impact on climate adaptation, highlighting management practices, environmental conditions, and interactions between sheep and local ecosystems are summarized in Table 1.

S. No.FactorDescriptionImpact on climate adaptation
1.Grazing managementRotational grazing, stocking rates, grazing duration, and rest periodsPromotes plant regrowth, soil health, and biodiversity, enhancing ecosystem resilience
2.Water managementAvailability and management of water sources for sheepEnsures sustainable water use, supports plant and animal life, and reduces overgrazing near water sources
3.Soil healthSoil composition, erosion control, and nutrient cyclingMaintains soil fertility and structure, prevents erosion, and enhances carbon sequestration
4.Vegetation typesDiversity of plant species, forage quality, and seasonal availabilitySupports diverse diets for sheep, reduces reliance on single forage type, and improves ecosystem stability
5.Climate conditionsTemperature, precipitation patterns, and extreme weather eventsInfluences migration timing and routes, affects forage availability, and requires adaptive management
6.Ecosystem interactionsRelationships between sheep, predators, other herbivores, and plant communitiesBalances grazing pressure, promotes natural predator-prey dynamics, and supports biodiversity
7.Habitat fragmentationImpact of human activities, land use changes, and barriers to migrationLimits migration routes, reduces access to forage and water, and necessitates connectivity conservation
8.Traditional knowledgeIndigenous and local knowledge of migration patterns, grazing practices, and environmental indicatorsEnhances adaptive management, integrates sustainable practices, supports cultural heritage
9.Technological integrationUse of GPS tracking, remote sensing, and IoT devices for monitoring sheep and environmental conditionsProvides real-time data for informed decision-making, improves efficiency, reduces overgrazing
10.Policy and regulationGovernment policies, subsidies, and regulations related to grazing and land useShapes management practices, encourages sustainable practices, mitigates negative environmental impacts

Table 1.

Factors affecting sheep migration and their impact on climate adaptation.

Source: Developed by the authors Dr. Vinod Bhateshwar and Basant Kumar Bhinchhar.

Overall, sheep migration’s impact on climate adaptation can vary widely depending on management practices, environmental conditions, and the interactions between sheep and local ecosystems. Sustainable management strategies that promote ecosystem health and resilience are crucial for ensuring that sheep migration contributes positively to adaptation efforts.

2.2.1.2 Social dynamics

The effect of migration on sheep social dynamics can vary depending on several factors, including the species of sheep, the type of migration, and environmental conditions. Migration can impact the cohesion of sheep groups. During migration, sheep often move in herds, which can strengthen social bonds among individuals within the group [47]. Migration may influence the establishment or reinforcement of social hierarchies within sheep herds. Dominant individuals may assert their leadership during migration, guiding the group and making decisions about when and where to move. Migration can be a stressful experience for sheep, especially if they encounter unfamiliar environments or predators along the migration route [48]. This stress can lead to increased aggression within the group as individuals compete for resources or jostle for positions within the herd hierarchy.

Migration may impact the communication patterns of sheep. During migration, sheep may use vocalizations, body language, and scent marking to maintain contact with group members, navigate their environment, and coordinate movement [49]. Migration provides opportunities for social learning among sheep. Younger individuals may learn migration routes and behaviors from older, more experienced group members, contributing to the transmission of knowledge within the herd [50]. Migration allows sheep to access different grazing areas and seasonal resources. The movement of sheep herds across landscapes can influence vegetation dynamics and ecosystem processes, shaping the availability and distribution of resources for both sheep and other species [51]. Migration can facilitate genetic mixing among sheep populations. As herds move between different areas, they may encounter individuals from other groups or populations, leading to gene flow and genetic diversity within the overall sheep population [52]. Overall, migration plays a significant role in shaping the social dynamics of sheep herds, impacting their behavior, communication, and interactions with both their environment and other individuals within the group.

2.2.1.3 Feeding behavior

Sheep migration can significantly impact their feeding behavior due to various factors such as the availability of forage, competition with other animals, environmental conditions, and the physiological state of the sheep themselves [41]. During migration, sheep may encounter different grazing areas with varying vegetation types and densities. This can influence their feeding behavior as they adapt to the available forage. They may spend more time searching for suitable food sources or adjust their diet based on what is accessible in each location [34]. In areas where multiple herds or species of animals migrate together, there can be increased competition for food resources. Sheep may need to alter their feeding behavior to compete effectively with other grazers, such as by grazing at different times of the day or selecting less-preferred forage if preferred options are scarce (Figure 3) [51]. Sheep have specific nutritional requirements based on factors like age, reproductive status, and stage of production. Migration may affect the availability of forage that meets these nutritional needs, leading to changes in feeding behavior as sheep prioritize obtaining essential nutrients [53].

Figure 3.

During migration grazing at different times of the day or selecting less-preferred forage when sheep-preferred options are scarce. Source: Developed by the author Dr. Vinod Bhateshwar.

Sheep are social animals and often exhibit flocking behavior, especially during migration [6]. Social dynamics within the flock can influence feeding behavior, with dominant individuals accessing preferred forage more readily or influencing the movement patterns of the entire group. Environmental factors such as weather, terrain, and water availability can impact sheep migration routes and grazing patterns. Extreme weather conditions or challenging terrain may necessitate changes in feeding behavior as sheep adapt to the environment to meet their nutritional requirements [54]. During migration, sheep may encounter increased predation risk, especially if they move through areas inhabited by predators. This can influence their feeding behavior, causing them to be more vigilant or selective in their foraging to minimize the risk of predation. The distance and duration of migration can affect sheep feeding behavior. Long-distance migrations may require sheep to prioritize energy conservation, leading to adjustments in feeding patterns, while shorter migrations may allow for more consistent grazing behavior [55]. The factors influencing sheep migration and their impact on feeding behavior are listed in Table 2.

S. No.FactorDescriptionImpact on feeding behavior
1.Seasonal changesVariations in temperature, precipitation, and forage availability across seasonsAlters the availability and quality of forage, influencing grazing patterns and diet diversity
2.Grazing pressureIntensity and duration of grazing in specific areasThis can lead to overgrazing, depletion of preferred forage species, and shifts to less desirable forage
3.Water availabilityProximity and accessibility of water sourcesAffects grazing locations and movement patterns, with sheep staying closer to water sources
4.Habitat fragmentationBarriers such as fences, roads, and human settlementsLimits access to diverse grazing areas, reducing diet variety and potentially overgrazing certain areas
5.Forage diversityThe presence of multiple plant species and typesPromotes a varied diet, allowing sheep to balance nutrient intake and avoid toxic plants
6.TopographyTerrain features such as hills, valleys, and plainsInfluences grazing efficiency and energy expenditure, with sheep preferring certain terrains for feeding
7.Predator presenceRisk of predation from wild animalsThis may cause sheep to avoid certain areas or change grazing times to safer periods
8.Human activitiesAgricultural practices, land use changes, and human disturbancesCan disrupt grazing patterns, force migrations, and alter feeding behavior
9.Social structureFlock dynamics, leadership, and social interactions within the herdDetermines movement patterns and grazing site selection, with dominant sheep influencing flock behavior
10.Disease and parasite loadPresence of diseases and parasitic infestationsCan reduce grazing efficiency and alter feeding behavior due to health impacts

Table 2.

Various factors affect sheep migration and their impact on feeding behavior.

Source: Developed by the authors Dr. Vinod Bhateshwar and Basant Kumar Bhinchhar.

Overall, the effects of sheep migration on feeding behavior are complex and multifaceted, influenced by a combination of ecological, social, and physiological factors. Understanding these dynamics is important for managing grazing lands and ensuring the welfare and productivity of sheep populations.

2.2.1.4 Predator avoidance

Migration can expose sheep to different predators along their routes. This may lead to changes in vigilance behavior, with sheep becoming more cautious or developing strategies to avoid predation, such as traveling in larger groups or utilizing terrain features for protection [48]. When sheep migrate in large groups, there is a dilution effect where individual sheep have a lower risk of predation because predators are less likely to focus on any one individual. Predators may find it difficult to single out and attack prey amidst a large moving flock [56]. Sheep tend to be more vigilant during migration, as they are exposed to a higher risk of predation. This heightened vigilance can make it easier for them to detect predators and take evasive action.

Migration often involves herding behavior, where sheep stick together closely. This group behavior can serve as a form of defense against predators, as larger groups are more intimidating and can collectively defend against attacks [57]. Migration may lead sheep to areas with better natural defenses against predators, such as higher ground or areas with dense vegetation. This can reduce their vulnerability to predation during migration periods. While migration offers some benefits in terms of predator avoidance, it also exposes sheep to different risks [58]. For example, during migration, sheep may have to navigate unfamiliar terrain, which can increase their vulnerability to predators who are more familiar with the area [48]. The movement of large groups of sheep during migration can attract predators, leading to dynamic predator-prey interactions. Predators may actively follow migrating herds, which can influence the timing and route of migration for the sheep [59]. Overall, the effect of sheep migration on predator avoidance is multifaceted and depends on various factors such as the behavior of both predators and prey, the landscape, and the presence of other environmental factors.

2.2.1.5 Human interaction

Migration routes may intersect with human settlements or infrastructure, exposing sheep to various human activities. This could lead to habituation or avoidance behaviors in response to human presence, impacting their grazing patterns and movement. Human activities such as urbanization, agriculture, and infrastructure development can fragment natural habitats, disrupting traditional migration routes for sheep [19]. This fragmentation may force sheep to alter their routes or navigate through unfamiliar territories, which can increase their vulnerability to predation and decrease access to essential resources like food and water [60]. Physical barriers like fences, highways, and other human-made structures can obstruct sheep migration paths [61]. These barriers can disrupt the natural flow of migration and may require sheep to deviate from their usual routes or expend additional energy to navigate around them. These barriers can sometimes lead to injuries or fatalities among migrating sheep. Human presence, including recreational activities such as hiking, camping, and off-road vehicle use, can disturb sheep and cause them to avoid areas of high human activity. This disturbance can lead to changes in migration patterns as sheep seek quieter and less disturbed areas, potentially altering their routes and timing of movement [62]. Human activities can indirectly influence predation risk for migrating sheep. For example, the presence of human settlements or livestock can attract predators to areas that sheep frequent during migration, increasing the likelihood of predation events [63]. In response, sheep may alter their migration routes to avoid areas with heightened predation risk, leading to changes in their overall migration patterns. While not directly related to human interaction, human-induced climate change can have significant impacts on sheep migration routes by altering habitat conditions and resource availability [64]. Changes in temperature, precipitation patterns, and vegetation dynamics can influence the timing and distribution of food and water resources along migration routes, prompting sheep to modify their movements in response to these environmental changes [65]. Overall, human interaction can disrupt the natural behavior of sheep and alter their migration routes, which can have implications for their survival, population dynamics, and ecosystem functioning. Conservation efforts aimed at minimizing human-induced disturbances and preserving critical habitat corridors are essential for maintaining healthy and resilient sheep populations.

2.2.1.6 Reproductive patterns

Migration can significantly impact the reproductive patterns of sheep due to various factors related to changes in the environment, nutrition, stress levels, and social dynamics and may affect the timing of mating seasons and birthing patterns [26]. Sheep often exhibit seasonal breeding patterns, influenced by factors like day length and temperature. Migration may alter the timing or availability of breeding resources, affecting the synchronization of estrus cycles among ewes [66]. Migration can lead to changes in available forage and water sources. Inadequate nutrition can negatively impact reproductive health, leading to decreased fertility rates, lower conception rates, and increased embryonic loss [67]. The physical exertion of migration, especially over long distances or challenging terrain, can induce stress in sheep. Chronic stress can disrupt hormonal balances, affecting reproductive hormone secretion and leading to irregular estrus cycles or anestrus [68]. Migration often involves the mixing of different sheep populations, introducing new social hierarchies and dynamics. Dominance hierarchies within groups can influence mating behavior and access to mates, potentially affecting reproductive success. Migration routes may expose sheep to increased predation risk, causing heightened stress levels. Fear of predation can trigger physiological responses that impact reproductive hormones and behavior [48].

Migration may expose sheep to varying climates and weather conditions. Extreme temperatures or weather events can induce stress and impact reproductive function, particularly during critical stages such as mating or pregnancy. Migration can increase exposure to parasites such as internal worms, which can affect sheep’s health and reproductive performance. Parasite infestations can lead to nutrient deficiencies, anemia, and overall poor reproductive outcomes. Migration can facilitate genetic exchange between different sheep populations. This genetic mixing may introduce traits related to reproductive performance, such as fertility or fecundity, which can influence future breeding patterns [69]. Overall, the effects of migration on sheep reproductive patterns are complex and multifaceted, depending on various environmental, physiological, and social factors. Management practices that mitigate stress, ensure adequate nutrition, and minimize exposure to disease and predators are essential for maintaining optimal reproductive health in migrating sheep populations. Here is a comprehensive Table 3 summarizing the various factors that influence sheep migration and their impacts on reproductive patterns.

S. No.FactorDescriptionImpact on reproductive patterns
1.Seasonal breeding patternsInfluenced by day length and temperature changesMigration may alter the timing or availability of breeding resources, affecting the synchronization of estrus cycles among ewes
2.Nutritional statusAvailability and quality of forage impacting body condition and energy reservesInadequate nutrition can lead to decreased fertility, lower conception rates, and increased embryonic loss
3.Stress levelsPhysical and environmental stress from migration and habitat changesChronic stress can disrupt hormonal balances, causing irregular estrus cycles or anestrus
4.Social dynamicsChanges in flock structure, dominance hierarchies, and mating opportunitiesAltered social dynamics can influence mating behavior and reproductive success
5.Water and forage availabilityChanges in available resources due to migrationAffects nutrition intake and health, potentially impacting fertility and overall reproductive performance
6.Predation riskIncreased stress levels due to exposure to predatorsFear of predation can affect reproductive hormone secretion and behavior, potentially reducing fertility rates
7.Climate and weather conditionsExposure to varying climates and extreme weather events during migrationExtreme temperatures or weather events can stress sheep and impact reproductive function
8.Parasite infestationsExposure to parasites such as internal wormsParasite infections can lead to nutrient deficiencies, anemia, and poor reproductive outcomes
9.Genetic exchangeMixing of different sheep populations during migrationIntroduces genetic traits related to reproductive performance, influencing future breeding patterns

Table 3.

Various factors impact reproductive patterns in sheep.

Source: Developed by the authors Dr. Vinod Bhateshwar and Basant Kumar Bhinchhar.

2.2.1.7 Cultural influences

Sheep migration can have various effects on cultural influences, depending on the context and the specific cultural practices of the communities involved. In many pastoralist cultures, sheep migration is a deeply ingrained tradition. The movement of sheep herds from one grazing area to another may be a central aspect of cultural identity and heritage [70]. This tradition can be passed down through generations, shaping cultural practices, rituals, and oral traditions. Sheep migration can significantly influence economic activities in pastoralist societies. The timing and routes of migration can impact trading patterns, market dynamics, and economic relationships with neighboring communities [71]. Economic exchanges related to sheep farming, such as wool and meat production, can also contribute to cultural exchanges and interactions. Sheep migration often involves communal cooperation among pastoralist communities. The coordination required for successful migrations fosters social cohesion and strengthens bonds within the community. Cultural values such as cooperation, reciprocity, and solidarity are reinforced through collective efforts to manage and execute the migration process. Pastoralist cultures develop extensive knowledge about the land, weather patterns, and ecosystems through generations of sheep migration [11].

This ecological knowledge forms an integral part of cultural identity and influences decision-making processes related to resource management and adaptation to environmental changes. Sheep migration routes often intersect with trade routes and pathways of cultural exchange. As pastoralist communities move their herds, they may encounter other groups with different cultural practices, languages, and belief systems [72]. These encounters can facilitate cultural exchange, leading to the adoption of new customs, technologies, and ideas. Sheep migration can sometimes lead to conflicts, especially in areas where resources are scarce or contested [73]. Conflicts over grazing rights, water access, or land ownership can arise between pastoralist communities or with sedentary agriculturalists.

However, these conflicts also provide opportunities for cultural negotiation, conflict resolution, and the establishment of customary laws and agreements. In the face of modernization and external pressures, sheep migration serves as a means of preserving traditional cultural practices and knowledge systems [74]. At the same time, pastoralist cultures may also adapt their migration practices in response to changing socio-economic conditions, environmental challenges, and government policies. Overall, sheep migration plays a multifaceted role in shaping cultural influences, contributing to the resilience, adaptation, and diversity of pastoralist societies around the world.

Overall, the effects of migration on the behavioral adaptations of sheep in India are multifaceted and influenced by a variety of factors including environmental conditions, social dynamics, and cultural practices. Understanding these dynamics is crucial for effective sheep management and conservation efforts in diverse landscapes.

2.3 Environmental stress factors

Sheep migrations can be stressful events for the animals involved, primarily due to changes in their environment, social dynamics, and physical exertion. Here are some common stressors encountered by sheep during migration:

2.3.1 Environmental changes

Sheep migrating often encounter changes in terrain, weather conditions, and vegetation. Extreme weather events such as storms, heavy rain, or heat waves can cause stress by disrupting their usual grazing patterns and shelter options [75]. Sheep migrate in search of food, water, and suitable grazing grounds. Environmental changes such as droughts, floods, or changes in vegetation patterns can alter the availability and distribution of these resources. If the usual migration routes become disrupted or if resources become scarce, sheep may experience stress due to inadequate nutrition or dehydration [1]. Sheep are sensitive to temperature changes. Extreme heat or cold can induce stress, affecting their ability to migrate effectively. Climate change, leading to more frequent and intense heatwaves or cold spells, can disrupt migration patterns and increase stress levels among sheep [3]. Changes in environmental conditions can also influence predator-prey dynamics. For instance, alterations in vegetation cover or water availability may affect the distribution and abundance of predators. Sheep may experience heightened stress if they perceive increased predation risk during migration.

Environmental changes can facilitate the spread of infectious diseases among sheep populations [76]. Crowding during migration, compromised immune responses due to stress, and altered environmental conditions conducive to pathogen survival can increase the likelihood of disease transmission, leading to additional stress among sheep [77]. Sheep are social animals that rely on group cohesion during migration. Environmental changes that disrupt social structures or lead to increased competition for resources within the group can induce stress [77]. For example, if resource availability decreases, dominant individuals may monopolize access to food and water, causing stress among subordinate sheep. Environmental changes can also cause psychological stress among sheep [36]. Disorientation, confusion, and anxiety may result from sudden alterations in familiar landscapes or disruptions to established migration patterns. Additionally, noise pollution from human activities or natural disasters such as storms or wildfires can further exacerbate stress levels [78].

To mitigate the impact of environmental changes on sheep migration stress, conservation efforts should focus on preserving and restoring natural habitats, implementing sustainable land management practices, and monitoring and managing wildlife populations. Additionally, measures to enhance resilience in sheep populations, such as providing supplementary feeding during periods of resource scarcity or establishing wildlife corridors to facilitate safe migration, can help alleviate stress and promote population health.

2.3.1.1 Predator threats

Environmental predator threats can significantly impact the stress levels of sheep. When sheep perceive a predator threat, their bodies release stress hormones like cortisol [48]. Elevated cortisol levels indicate heightened stress, which can have negative impacts on their health and well-being [79]. Sheep may exhibit altered behavior in response to predator threats. They may become more vigilant, spending more time scanning their surroundings for potential threats. This heightened vigilance can lead to decreased feeding and resting behaviors, which can further impact their health and productivity [48]. Prolonged exposure to predator threats can disrupt reproductive patterns in sheep [48]. Stress hormones can interfere with reproductive hormones, leading to decreased fertility and reproductive success [80]. Chronic stress resulting from persistent predator threats can weaken the immune system of sheep, making them more susceptible to diseases and infections. This can lead to higher mortality rates and reduced overall herd health [48].

Stress can also hinder the growth and development of lambs [81]. Pregnant ewes experiencing stress due to predator threats may produce smaller and weaker offspring, affecting the overall productivity of the flock [48]. Continual exposure to predator threats can result in long-term psychological stress in sheep. This can manifest in various ways, including decreased resilience to future stressors, altered social behavior, and even symptoms of anxiety or depression [82].

To mitigate these effects, sheep farmers often implement predator control measures such as using guardian animals, installing fences, or employing deterrents like lights or sound devices to reduce the risk of predator attacks. Additionally, providing a safe and secure environment for sheep, such as well-designed shelters or pasture management strategies, can help minimize stress levels and promote overall welfare.

2.3.1.2 Social hierarchy

The influence of environmental social hierarchy on sheep migration is an interesting aspect of animal behavior and ecology [6]. Sheep, like many other social animals, exhibit a hierarchical social structure within their groups. This hierarchy often determines access to resources such as food, water, and mates, as well as social interactions within the group [83]. In the context of migration, the social hierarchy can play a significant role in shaping the behavior of individual sheep and the dynamics of the entire flock. Here are some ways in which environmental social hierarchy may impact sheep migration, in sheep groups, dominant individuals often emerge as leaders, guiding the movements of the flock [41]. These leaders may have a greater influence on migration decisions, determining when and where the flock moves based on their knowledge of the environment and available resources. Sheep lower in the social hierarchy may follow dominant individuals to ensure access to resources during migration [84]. Dominant individuals may have priority access to preferred foraging areas or water sources, and subordinate sheep may benefit from following them to gain access to these resources.

Dominant individuals within the flock may also provide a sense of security and protection during migration [85]. Subordinate sheep may feel safer following dominant individuals, especially in unfamiliar or potentially dangerous environments. The social hierarchy can contribute to the cohesion of the flock during migration. Subordinate sheep may be more likely to stay with the group and follow dominant individuals, maintaining the integrity of the flock as it moves across the landscape [41]. In some cases, the social hierarchy within the flock may lead to competition and conflict during migration. Dominant individuals may compete for leadership roles, leading to challenges or aggressive interactions within the group [6]. This competition could influence the direction or pace of migration. Sheep may learn from each other during migration, with dominant individuals playing a key role in transmitting knowledge about the landscape and optimal migration routes. This social learning can help the flock adapt to changes in the environment or respond to challenges encountered during migration [6].

Overall, the environmental social hierarchy within sheep groups can have significant effects on migration behavior, shaping the decisions of individual sheep and the collective movement of the flock across the landscape. Understanding these dynamics is important for conservation efforts and the management of sheep populations in natural habitats.

2.3.1.3 Physical exertion

Physical exertion can have various effects on sheep migration, depending on factors such as the duration, intensity, and timing of the exertion, as well as environmental conditions and the health and fitness of the sheep involved [86]. Here are some potential effects: Physical exertion can influence the speed at which sheep migrate. If the exertion is strenuous, such as climbing steep terrain or traversing long distances without rest, it may slow down the migration process as the sheep need to conserve energy [87].

Exertion increases the energy expenditure of sheep. They need to consume more food and water to replenish the expended energy, which can affect their grazing patterns and may lead them to seek out rest stops more frequently during migration. Prolonged or excessive exertion without adequate rest can lead to fatigue and physical strain in sheep [88]. This can make them more susceptible to injuries, illnesses, or conditions like heat stress or exhaustion, particularly if they are already in poor health or if environmental conditions are harsh. Sheep may exhibit changes in behavior in response to physical exertion during migration. They may become more restless, vocalize more, or display signs of stress or agitation. Alternatively, they may become more focused and determined as they navigate challenging terrain or obstacles.

Physical exertion can affect the cohesion and dynamics of the sheep group [89]. Fatigue or injury in some individuals may slow down the entire group, while stronger or more resilient individuals may lead the way or provide support to weaker members. The presence of physical exertion may influence the choice of migration routes. Sheep may prefer paths that offer easier terrain or access to resources like food, water, or shelter to mitigate the effects of exertion and conserve energy [4]. Prolonged or intense physical exertion during migration could potentially impact the reproductive success of sheep, particularly if it leads to stress, malnutrition, or injuries that affect fertility or the ability to care for offspring [39].

Overall, while physical exertion is a natural part of sheep migration, its effects can be complex and varied, influenced by a range of factors that interact with each other and with the intrinsic characteristics of the sheep population and their environment.

2.3.1.4 Food and water availability

Competition for resources within the flock or encountering scarcity can cause stress and nutritional deficiencies [90]. Sheep often migrate in response to seasonal changes in vegetation and water availability. During the dry season, they may move to areas where water is more abundant and vegetation is still relatively lush [91]. Conversely, during the wet season, they might migrate to higher elevations where vegetation is more abundant and water is plentiful. Sheep are selective grazers and prefer areas with high-quality forage [92]. They will migrate to areas where food resources are abundant and of good quality. If food availability decreases in one area due to overgrazing or environmental changes, sheep may move to other areas where forage is more plentiful. Access to water is crucial for sheep survival, especially in arid and semiarid regions (Figure 4). Sheep will often follow migration routes that lead to reliable water sources such as rivers, streams, or seasonal waterholes [93]. Migration routes may change depending on the availability of water along the way.

Figure 4.

Water scarcity for sheep in arid and semiarid regions in India. Source: Developed by the author Dr. Vinod Bhateshwar.

Sheep may also migrate to areas where they can avoid predators. This could mean moving to higher elevations where visibility is better or to areas with natural barriers that make it more difficult for predators to approach [94]. Human activities such as agriculture, urbanization, and fencing can impact the availability of food and water for sheep. In some cases, sheep may be forced to alter their migration routes or adapt to changes in their environment due to human intervention [95].

Overall, food and water availability are primary drivers of sheep migration routes, and these routes can vary widely depending on environmental conditions, seasonal changes, and human activities in the area. Understanding these factors is crucial for conservation efforts and sustainable management of sheep populations.

2.3.1.5 Human interference

Human interference can significantly impact sheep migration routes in various ways. Construction of roads, fences, and buildings can obstruct traditional migration paths, forcing sheep to detour or change their routes altogether [96]. These barriers can disrupt the natural flow of migration and isolate populations, leading to reduced genetic diversity and potential habitat fragmentation. Human activities such as agriculture, urbanization, and industrial development can alter the landscape and disrupt habitats along migration routes [97]. Conversion of natural habitats into farmland or urban areas can reduce available grazing areas for sheep and increase the likelihood of conflicts with human settlements. Pollution, deforestation, overgrazing by livestock, and resource extraction activities can degrade the quality of habitats along migration routes [98]. Loss of vegetation cover, water sources, and shelter can negatively impact sheep populations, making it difficult for them to find food and rest during their migrations. Increased human presence along migration routes can disturb sheep behavior and cause them to avoid certain areas or alter their movement patterns [99]. Activities such as recreational hiking, camping, hunting, and livestock grazing can create disturbances, noise, and potential conflicts with migrating sheep.

Overall, human interference can disrupt the natural processes that govern sheep migration, leading to habitat loss, fragmentation, and increased vulnerability to environmental stressors. Conservation efforts aimed at mitigating human impacts, preserving key habitats, and maintaining connectivity along migration routes are essential for ensuring the long-term survival of sheep populations.

2.3.1.6 Separation from lambs

Separation from lambs during migration can cause significant distress and anxiety among both ewes and their offspring [48]. This separation disrupts the strong bond between the mother and her lamb, leading to various behavioral and physiological stress responses [100]. For ewes, the separation from their lambs can result in increased vocalizations, restlessness, and attempts to reunite with their young [101]. This anxiety stems from their maternal instinct to protect and care for their lambs, and being unable to do so can cause significant stress.

Lambs, on the other hand, also exhibit signs of distress when separated from their mothers. They may bleat frequently, exhibit restlessness, and show decreased activity as they attempt to find their mothers [102]. The lack of maternal care can lead to increased vulnerability, reduced feeding, and overall impaired well-being. In addition to behavioral changes, both ewes and lambs can experience physiological stress responses [103]. Elevated levels of cortisol, a stress hormone, can be detected in their systems, indicating a state of heightened stress [104]. This can affect their immune function, growth, and overall health, making them more susceptible to diseases and other health issues.

Efforts to minimize separation during migration are crucial for maintaining the welfare of both ewes and lambs [105]. Ensuring that they remain together can help reduce stress, promote normal behavior, and support their overall health and well-being during the challenging migration process.

2.3.1.7 Unfamiliar territory

Sheep are creatures of habit and may experience stress when navigating unfamiliar terrain or encountering new obstacles along migration routes [106]. This behavior is rooted in their instincts and social structure. Sheep rely heavily on familiar surroundings and established pathways to feel secure. When faced with new environments or unexpected barriers, they can become anxious or disoriented [88]. This stress response can affect their overall well-being and movement efficiency.

To mitigate these issues, shepherds and farmers often take steps to gradually introduce sheep to new areas, using techniques such as leading with experienced animals or creating temporary enclosures that allow sheep to acclimate at their own pace. Understanding and managing the stress responses of sheep in unfamiliar territory is crucial for maintaining their health and ensuring smooth migrations or transitions between pastures.

2.3.1.8 Transportation

Transportation can indeed be a highly stressful experience for domesticated sheep due to several factors. When sheep are transported, they often face confinement in unfamiliar and sometimes cramped conditions, which can induce anxiety and stress [107]. The noise from the vehicle and external environment, along with the movement and vibrations, adds to their discomfort. If not handled properly, this stress can negatively impact their health and welfare. Proper handling during transportation is crucial to minimize stress, including ensuring adequate space, ventilation, and gentle handling practices [108]. Additionally, reducing the duration of transportation and providing rest periods can help mitigate some of the stress associated with the journey. By addressing these factors and implementing best practices, the welfare of sheep during transportation can be significantly improved, reducing the stress and associated negative impacts on their health and productivity.

2.3.1.9 Health issues

Migration can significantly impact the health of sheep, often exacerbating existing health issues or making them more susceptible to new diseases [109]. The act of migration itself can be highly stressful for sheep. This stress can weaken their immune system, making them more vulnerable to diseases. Stress factors include changes in the environment, handling during transportation, and disruption of their regular routines. Long-distance travel can lead to exhaustion. Fatigue reduces the animals’ ability to fend off illnesses and can exacerbate existing health problems, such as respiratory conditions or joint issues [88]. When sheep are moved to new environments, they may encounter unfamiliar pathogens to which they have no immunity [110]. This exposure can lead to outbreaks of diseases such as foot and mouth disease, bluetongue, or other infectious diseases prevalent in the new location [111].

Migration often involves changes in diet and water sources. Inadequate nutrition or changes in diet can affect sheep’s health, leading to issues like malnutrition or digestive problems [112]. Moving to a different climate can expose sheep to weather extremes they are not accustomed to, such as extreme heat or cold, which can exacerbate conditions like pneumonia or heat stress [3]. Migration can increase exposure to parasites, both internal and external, such as worms, ticks, and lice. These parasites can thrive in different environmental conditions, leading to increased infestation and subsequent health issues [113]. In conclusion, the process of migration can present significant health challenges for sheep, necessitating careful management and preventive measures to mitigate these risks.

Addressing these stressors requires careful planning and management practices to ensure the welfare of migrating sheep populations. Providing access to adequate food, water, and shelter, and minimizing disturbances can help reduce stress and promote a successful migration.

Sheep, like many other animals, experience a range of physiological responses to cope with stressors during migration. These responses involve changes in hormone levels, heart rate variability, and immune function, which help the animals adapt to the physical and psychological challenges they encounter.

2.4 Physiological responses to stress

Sheep, like many other animals, experience a range of physiological responses to cope with stressors during migration. These responses involve changes in hormone levels, heart rate variability, and immune function, which help the animals adapt to the physical and psychological challenges they encounter.

2.4.1 Hormone levels

Hormones play a crucial role in the physiological responses to stress in sheep, just as they do in other mammals. When sheep encounter stressors, whether they are environmental, social, or physiological, their bodies initiate a cascade of hormonal responses to help them cope. Here is how hormones contribute to these responses:

2.4.1.1 Cortisol

Often referred to as the stress hormone, cortisol is released by the adrenal glands in response to stress. In sheep, cortisol levels rise in situations of stress, such as during handling, transportation, or exposure to predators [114]. Cortisol helps mobilize energy reserves by increasing blood glucose levels, ensuring that the sheep have the energy needed to respond to the stressor [39]. It also suppresses nonessential functions such as growth, reproduction, and immune responses temporarily to prioritize survival.

2.4.1.1.1 Adrenaline (epinephrine)

Another hormone released by the adrenal glands, adrenaline is part of the immediate stress response known as the fight-or-flight response [115]. In sheep, as in other animals, adrenaline triggers rapid physiological changes, including increased heart rate, rapid breathing, and heightened alertness [88]. These changes prepare the sheep to either confront the stressor or flee from it.

2.4.1.1.2 Thyroid hormones

Thyroid hormones, such as thyroxine and triiodothyronine, also play a role in the stress response [116]. They help regulate metabolism, which can be altered during stressful situations. Thyroid hormones influence energy expenditure and thermoregulation, ensuring that the sheep can adapt to the demands imposed by the stressor [103].

2.4.1.1.3 Vasopressin

This hormone, also known as antidiuretic hormone (ADH), is released by the pituitary gland in response to stress. Vasopressin helps regulate water balance in the body by promoting water reabsorption in the kidneys [117]. During stress, vasopressin levels increase, reducing urine output and helping maintain blood pressure and hydration levels [118].

2.4.1.1.4 Oxytocin

While often associated with social bonding and reproduction, oxytocin also plays a role in stress responses. In sheep, oxytocin can have calming effects and help mitigate the negative impacts of stress [119]. It promotes social bonding and affiliative behaviors, which can reduce stress levels and improve overall well-being [120].

These hormones work together to enable sheep to cope with various stressors they encounter in their environment. However, prolonged or chronic stress can have detrimental effects on sheep health and welfare, disrupting hormone balance and leading to various physiological and behavioral issues. Therefore, sheep farmers and caretakers need to minimize stressors and provide appropriate management practices to ensure the well-being of their animals.

2.4.2 Heart rate variability (HRV)

Heart rate variability (HRV) refers to the variation in time intervals between heartbeats, influenced by the autonomic nervous system (ANS). It is often used as a measure of physiological stress in various organisms, including sheep. In sheep, HRV can be indicative of their response to stressors [121]. When faced with stress, whether it is due to environmental factors, handling, or social dynamics within a flock, sheep typically exhibit changes in their autonomic nervous system activity, which can affect HRV.

Research has shown that acute stressors can lead to a decrease in HRV in sheep. For example, exposure to novel environments, handling procedures, or sudden loud noises can trigger a stress response, leading to a decrease in HRV [122]. Conversely, when sheep are in a relaxed or non-stressful state, their HRV tends to be higher. Monitoring HRV in sheep can provide valuable insights into their welfare and management. By assessing HRV responses, farmers and researchers can identify stressors in the environment or management practices that maybe negatively impacting the animals. This information can then be used to implement strategies to reduce stress and improve the overall well-being of the flock. In summary, HRV serves as a useful tool for assessing the physiological responses of sheep to stressors, helping to inform management practices aimed at promoting animal welfare.

2.4.2.1 Immune function

The immune system plays a crucial role in the physiological responses to stress in sheep, as it does in all mammals [123]. Stress can come from various sources in a sheep’s environment, such as changes in diet, temperature, social interactions, or predator threats. Here is how the immune function intersects with stress responses in sheep:

2.4.2.1.1 Impact on immune function

Stress triggers the release of stress hormones like cortisol, which can suppress the immune system’s function. In sheep, as in humans, prolonged stress can lead to decreased immune cell activity, making them more susceptible to infections and diseases [124].

2.4.2.1.2 Susceptibility to infections

When sheep are stressed, their immune system’s ability to respond to pathogens may be compromised [125]. This can increase the risk of infections such as bacterial pneumonia or parasitic infestations like gastrointestinal nematodes.

2.4.2.1.3 Wound healing

Stress can impair wound healing in sheep by reducing the immune response at the site of injury [126]. This can prolong recovery times and increase the risk of secondary infections.

2.4.2.1.4 Vaccination response

Stress can also affect the efficacy of vaccinations in sheep. High levels of stress hormones can dampen the immune response to vaccines, leading to reduced protection against infectious diseases [127].

2.4.2.1.5 Nutritional immunity

Stress can influence nutrient utilization and absorption in sheep, which in turn affects their immune function [128]. Proper nutrition is essential for maintaining a robust immune system and mitigating the negative effects of stress.

2.4.2.1.6 Behavioral changes

Stress can induce changes in sheep behavior, such as increased aggression or reduced social interactions, which may further impact their susceptibility to diseases. Social stress, for example, can disrupt the hierarchy within a flock and lead to increased disease transmission [129].

2.4.2.1.7 Management practices

Understanding the interaction between stress and immune function is crucial for implementing effective management practices in sheep farming. Minimizing stressors, providing adequate nutrition, and ensuring proper vaccination protocols can help support the immune health of sheep and improve overall flock productivity [130].

In summary, the immune function in sheep is closely linked to their physiological responses to stress. Minimizing stressors and promoting overall welfare is essential for maintaining a healthy immune system and reducing the risk of diseases in sheep populations.

2.4.3 Behavioral and metabolic adjustments

Sheep, like all animals, experience stress in various forms, and their bodies respond with a complex interplay of behavioral and metabolic adjustments. Here is how sheep typically respond:

2.4.3.1 Behavioral responses

2.4.3.1.1 Flight or fight

When faced with a stressor, sheep may exhibit a flight response by trying to escape the situation or a fight response by standing their ground and showing defensive behaviors [131].

2.4.3.1.2 Grazing and resting patterns

Stress can disrupt normal feeding and resting behaviors in sheep. They may reduce their food intake and spend less time resting, which can affect their overall health and productivity [132].

2.4.3.1.3 Social interactions

Stress can alter social interactions among sheep, leading to changes in dominance hierarchies, aggression levels, and affiliative behaviors within the flock.

2.4.3.1.4 Metabolic responses

2.4.3.1.4.1 Activation of the hypothalamic: Pituitary: Adrenal (HPA) axis

In response to stress, the HPA axis is activated, leading to the release of cortisol from the adrenal glands [133]. Cortisol helps mobilize energy reserves by increasing glucose levels in the blood.

2.4.3.1.4.2 Energy metabolism

Stress can lead to alterations in energy metabolism in sheep. Glucose is redirected from nonessential tissues to organs vital for the stress response, such as the brain and muscles [134].

2.4.3.1.4.3 Immune function

Prolonged stress can suppress the immune system in sheep, making them more susceptible to diseases and infections [48].

2.4.3.1.4.4 Gastrointestinal function

Stress can disrupt gastrointestinal function, leading to reduced feed intake, altered nutrient absorption, and digestive disorders in sheep [135].

2.4.3.1.5 Long-term adaptations

2.4.3.1.5.1 Habituation

Sheep may become habituated to chronic stressors over time, leading to reduced physiological responses to repeated stress exposure [136].

2.4.3.1.5.2 Epigenetic changes

Prolonged or severe stress can induce epigenetic changes in sheep, altering gene expression patterns that may persist across generations [137].

2.4.3.1.5.3 Health and productivity

Chronic stress can have detrimental effects on the health and productivity of sheep, leading to reduced growth rates, reproductive performance, and wool quality [39].

Understanding the behavioral and metabolic adjustments in physiological responses to stress is crucial for implementing effective management strategies to minimize stress and promote the well-being of sheep in farming and husbandry practices.

In summary, sheep cope with the stressors of migration through a complex interplay of hormonal changes, autonomic nervous system adjustments, and immune function modulation. These physiological responses are critical for maintaining energy balance, protecting against infections, and ensuring survival during the demanding migratory period.

2.5 Genetic adaptations

Genetic adaptations in sheep populations reflect millennia of evolutionary pressure to thrive in diverse environments. These adaptations enable them to migrate over long distances and survive in various climates and terrains. Here are some key areas of research and findings:

2.5.1 Wool characteristics

Sheep have been selectively bred for wool traits that offer protection against harsh climates. Different breeds exhibit variations in wool type, density, and color, all of which contribute to their adaptability [138]. For instance, Merino sheep, originating from Spain, have fine wool suited for cold environments, while breeds like the Barbados Blackbelly have coarser wool adapted to warmer climates [139].

2.5.2 Heat tolerance

Sheep in arid and hot regions have developed mechanisms to cope with heat stress. Genetic studies have identified genes associated with heat tolerance, such as those involved in thermoregulation and sweat gland activity [140]. Understanding these genetic factors can inform breeding programs aimed at developing heat-tolerant sheep breeds.

2.5.3 Foraging behavior

Sheep exhibit diverse foraging behaviors influenced by their genetic makeup and environmental conditions. Research has shown that certain genes are associated with grazing preferences, browsing tendencies, and the ability to thrive on different types of vegetation [141]. These genetic adaptations allow sheep to exploit varied food sources in their habitats, enhancing their survival prospects.

2.5.4 Disease resistance

Sheep populations in different regions have evolved resistance to local pathogens and parasites. Genetic studies have identified genes involved in immune response and disease resistance, offering insights into natural defense mechanisms. Breeding for disease resistance can help reduce the reliance on chemical interventions and enhance the overall health of sheep populations [142].

2.5.5 Hoof structure

Sheep inhabiting mountainous regions have adapted to rugged terrain through changes in hoof morphology. Genetic research has revealed variations in genes related to hoof development and strength, which contribute to agility and stability in rocky landscapes. Understanding these genetic adaptations can inform breeding strategies aimed at improving hoof health and durability.

2.5.6 Migration patterns

Genetic analyses have provided insights into the historical migration patterns of sheep populations. By studying genetic markers, researchers can trace the ancestry and dispersal routes of different breeds, shedding light on past human migrations and trade routes. This information is valuable for conservation efforts and maintaining genetic diversity within sheep populations.

Overall, genetic adaptations in sheep populations underscore the dynamic interplay between natural selection, environmental pressures, and human intervention. Continued research into sheep genomics holds promise for understanding and harnessing genetic diversity to enhance the resilience and productivity of these important livestock species.

2.6 Human impacts on migration

Human activities can significantly influence sheep migration behavior and adaptation through various means such as land use changes, infrastructure development, and grazing regulations. Here is an examination of each of these factors:

2.6.1 Land-use changes

2.6.1.1 Urbanization

The expansion of urban areas can encroach upon traditional sheep grazing lands, reducing available habitat and forcing migrations to alternative areas.

2.6.1.2 Agricultural expansion

Controlling natural habitats into agricultural lands can fragment migration routes, disrupt access to seasonal forage, and lead to conflicts between livestock and farmers.

2.6.1.3 Deforestation

Deforestation alters the landscape, reducing the availability of shelter and forage for migrating sheep. It can also increase soil erosion, affecting the quality of grazing lands.

2.6.2 Infrastructure development

2.6.2.1 Roads and highways

Construction of roads and highways can fragment migration corridors, creating barriers that disrupt traditional migration patterns. Sheep may be reluctant to cross roads due to the increased risk of predation and collisions with vehicles.

2.6.2.2 Fences

Fencing associated with infrastructure development can impede the movement of sheep, obstructing migration routes and leading to population isolation. Moreover, fences can increase the risk of entanglement and injury for migrating animals.

2.6.2.3 Dams and reservoirs

The construction of dams and reservoirs can flood grazing lands and disrupt water sources, altering migration routes and limiting access to essential resources for sheep.

2.6.3 Grazing regulations

2.6.3.1 Overgrazing

Poorly regulated grazing practices can lead to overgrazing, degrading vegetation, and reducing forage availability along migration routes. This can force sheep to travel longer distances in search of suitable feeding grounds, increasing energy expenditure and vulnerability to predation.

2.6.3.2 Seasonal grazing restrictions

Grazing regulations restricting access to certain areas during critical times of the year can disrupt traditional migration patterns, forcing sheep to alter their routes or remain in less suitable habitats.

2.6.3.3 Predator control

Human interventions aimed at predator control, such as culling or fencing, can indirectly influence sheep migration behavior by altering predator-prey dynamics along migration routes.

Overall, human activities have the potential to significantly impact sheep migration behavior and adaptation by altering habitat availability, fragmenting migration corridors, and disrupting access to essential resources. Sustainable land management practices and conservation efforts are essential to mitigate these impacts and ensure the long-term viability of sheep populations and their migratory behaviors.

2.7 Future research directions

Understanding sheep migration patterns and behavioral adaptations in Indian grazing lands requires a multifaceted approach that combines traditional ecological studies with cutting-edge technology and interdisciplinary collaboration. Here are some future research directions that could enhance our understanding:

2.7.1 GPS tracking and remote sensing

Implementing GPS tracking devices on individual sheep can provide high-resolution data on movement patterns, grazing behavior, and habitat preferences. Combining this with remote sensing techniques such as satellite imagery and drones can offer a comprehensive view of landscape dynamics and resource availability.

2.7.2 Social network analysis

Investigate the social structure within sheep herds to understand how social interactions influence migration decisions and resource utilization. Social network analysis can reveal leadership dynamics, communication patterns, and information transfer among individuals within the flock.

2.7.3 Genomic studies

Explore the genetic basis of migratory behavior and adaptation to different environments in Indian sheep breeds. Comparative genomics can identify genetic markers associated with traits such as migratory tendency, foraging efficiency, and tolerance to environmental stressors.

2.7.4 Ethnographic studies

Collaborate with local communities and traditional shepherds to document Indigenous knowledge and practices related to sheep migration. Ethnographic research can provide insights into historical migration routes, cultural significance of grazing lands, and traditional management strategies.

2.7.5 Climate change impacts

Investigate how climate change is affecting sheep migration patterns and grazing behavior in Indian landscapes. Long-term monitoring coupled with climate modeling can elucidate the drivers of change and potential adaptation strategies for both sheep and pastoral communities.

2.7.6 Ecosystem services assessment

Quantify the ecosystem services provided by migratory sheep grazing, including vegetation management, soil nutrient cycling, and biodiversity conservation. Understanding the ecological benefits of traditional grazing practices can inform sustainable land management policies.

2.7.7 Agent-based modeling

Develop agent-based models to simulate sheep movement and decision-making processes in response to changing environmental conditions and human activities. These models can help predict future migration patterns and assess the effectiveness of management interventions.

2.7.8 Interdisciplinary collaboration

Foster collaboration between ecologists, geneticists, climatologists, social scientists, and pastoral communities to integrate diverse perspectives and methodologies. Interdisciplinary research frameworks can generate holistic insights into the complex dynamics of sheep migration systems.

By pursuing these research directions, we can deepen our understanding of sheep migration patterns and behavioral adaptations in Indian grazing lands, ultimately supporting the conservation of biodiversity, sustainable land use practices, and the livelihoods of pastoral communities.

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3. Conclusion

The study of sheep migration patterns, behavioral adaptations, and their responses to environmental stress factors in Indian grazing lands reveals a fascinating interplay between instincts and environmental influences. Through centuries of evolution, sheep have developed sophisticated strategies for survival in diverse habitats, demonstrating remarkable resilience to challenges such as food scarcity, climatic variability, and human disturbances. However, the increasing pressures of anthropogenic activities pose significant threats to sheep populations and the ecosystems they inhabit. Sustainable management practices that prioritize habitat conservation, promote responsible grazing practices, and mitigate human-induced stressors are imperative for safeguarding the welfare of sheep and preserving the integrity of grazing lands. By fostering a deeper understanding of the complex dynamics shaping sheep behavior, we can work toward harmonizing human activities with the needs of these invaluable livestock species and the ecosystems they support.

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Conflicts of interest

The authors disclose that they have no conflicting interests.

References

  1. 1. Naqvi SMK, De K, Gowane GR. Sheep production system in arid and semi-arid regions of India. Annals of Arid Zone. 2013;52:3-4
  2. 2. Rawat GS, Adhikari BS. Ecology and Management of Grassland Habitats in India. ENVIS Bulletin: Wildlife & Protected Areas. Dehradun, India: Wildlife Institute of India; 2015;17:1-240
  3. 3. Sejian V, Samal L, Soren NM, Bagath M, Krishnan G, Vidya MK, et al. Adaptation strategies to counter climate change impact on sheep. In: Sheep Production Adapting to Climate Change. Singapore: Springer Nature Pte Ltd; 2017. pp. 413-430
  4. 4. Kilgour RJ, Waterhouse T, Dwyer CM, Ivanov ID. Farming systems for sheep production and their effect on welfare. The Welfare of Sheep. Springer Science+Business Media B.V.; 2008;6:213-265
  5. 5. Beaver BV, Höglund D. Efficient Livestock Handling: The Practical Application of Animal Welfare and Behavioral Science. London, UK: Academic Press; 2015:1-230. eBook ISBN: 9780124172876
  6. 6. Fisher A, Matthews L. The social behaviour of sheep. Social Behaviour in Farm Animals. 2001;6:211-245
  7. 7. Sejian V, Bhatta R, Gaughan JB, Dunshea FR, Lacetera N. Adaptation of animals to heat stress. Animal. 2018;12(s2):s431-s444
  8. 8. Nair MR, Sejian V, Silpa MV, Fonseca VF, de Melo Costa CC, Devaraj C, et al. Goat as the ideal climate-resilient animal model in tropical environment: Revisiting advantages over other livestock species. International Journal of Biometeorology. 2021;65:2229-2240
  9. 9. Guthmann A, Onyango MB, Iannarilli F, Packer C. Livestock activity shifts large herbivore temporal distributions to their crepuscular edges. Journal of Animal Ecology. 2024;93(2):231-245
  10. 10. Ikhuoso OA, Adegbeye MJ, Elghandour MM, Mellado M, Al-Dobaib SN, Salem AZ. Climate change and agriculture: The competition for limited resources amidst crop farmers-livestock herding conflict in Nigeria-a review. Journal of Cleaner Production. 2020;272:123104
  11. 11. Bhasin V. Pastoralists of Himalayas. Journal of Human Ecology. 2011;33(3):147-177
  12. 12. Singh R, Sharma RK, Babu S, Bhatnagar YV. Traditional ecological knowledge and contemporary changes in the agro-pastoral system of upper Spiti landscape, Indian trans-Himalayas. Pastoralism. 2020;10:15
  13. 13. Sharma G, Tambe S, Rawat GS, Arrawatia ML. Yak herding and associated transboundary issues in the Sikkim Himalaya, India. In: Yak Move Transboundary Challenges and Opportunities for Yak Raising in a Changing Hindu Kush Himalayan Region. Kathmandu, Nepal: International Centre for Integrated Mountain Development; 2016. pp. 93-112
  14. 14. Ahmad S, Mir N, Bhat S, Singh J. High altitude pasturelands of Kashmir Himalaya: Current status, issues and future strategies in a changing climatic scenario. Current Journal of Applied Science and Technology. 2018;27:1-10
  15. 15. Aryal S, Maraseni T, Cockfield G, de Bruyn LL. Transhumance, livestock mobility and mutual benefits between crop and livestock production. Sustainable Agriculture Reviews 31: Biocontrol. Cham: Springer; 2018;31:25-39
  16. 16. Dev I, Singh V, Misri B. Socio-economic profile of migratory graziers and participatory appraisal of forage production and utilization of an alpine pasture in north-west Himalaya. ENVIS Bulletin: Himalayan Ecology and Development; 2003;11(2):52-96
  17. 17. Mysterud A, Iversen C, Austrheim G. Effects of density, season and weather on use of an altitudinal gradient by sheep. Applied Animal Behaviour Science. 2007;108(1-2):104-113
  18. 18. White KS, Hood E, Wolken GJ, Peitzsch EH, Bühler Y, Wikstrom Jones K, et al. Snow avalanches are a primary climate-linked driver of mountain ungulate populations. Communications Biology. 2024;7(1):423
  19. 19. Wassie SB. Natural resource degradation tendencies in Ethiopia: A review. Environmental Systems Research. 2020;9(1):1-29
  20. 20. Das AP. Conservation efforts for east Himalayan biodiversity and need for the establishment of corridors. In: Ghosh C, Das AP, editors. Recent Studies in Biodiversity and Traditional Knowledge in India. Kolkata: Sarat Book House; 2011. pp. 329-346
  21. 21. Putfarken D, Dengler J, Lehmann S, Härdtle W. Site use of grazing cattle and sheep in a large-scale pasture landscape: A GPS/GIS assessment. Applied Animal Behaviour Science. 2008;111(1-2):54-67
  22. 22. Misra AK, Subramanyam KV, Babu MV, Reddy TY, Shivarudrappa B, Ramakrishna YS. Improving the livelihood of landless and marginal farmers through sheep rearing in rainfed agro-ecosystem of India. Livestock Research for Rural Development. 2006;18(5)
  23. 23. Louhaichi M, Chand K, Misra A, Gaur MK, Ashutosh S, Johnson DE, et al. Increasing Resilience of Livestock Migration in the Arid Areas of India: A Case Study of Livestock Mobility in the State of Rajasthan, India. Lebanon: International Center for Agricultural Research in the Dry Areas (ICARDA); 2015
  24. 24. Singh V. Environmental migration as planned livelihood among the rebaris of Western Rajasthan, India. Global Environment. 2012;5(9):50-73
  25. 25. Treydte AC, Schmiedgen A, Berhane G, Tarekegn KD. Rangeland forage availability and management in times of drought–A case study of pastoralists in Afar, Ethiopia. Journal of Arid Environments. 2017;139:67-75
  26. 26. Shinde AK, Sejian V. Sheep husbandry under changing climate scenario in India: An overview. Indian Journal Animal Sciences. 2013;83(10):998-1008
  27. 27. Namgail T, Bhatnagar YV, Mishra C, Bagchi S. Pastoral nomads of the Indian Changthang: Production system, landuse and socioeconomic changes. Human Ecology. 2007;35:497-504
  28. 28. Gregory A, Spence E, Beier P, Garding E. Toward best management practices for ecological corridors. Land. 2021;10(2):140
  29. 29. Trubins R. Land-use change in southern Sweden: Before and after decoupling. Land Use Policy. 2013;33:161-169
  30. 30. Papouchis CM, Singer FJ, Sloan WB. Responses of desert bighorn sheep to increased human recreation. The Journal of Wildlife Management. 2001;65(3):573-582
  31. 31. Naqvi SM, De K, Kumar D, Sahoo A. Mitigation of climatic change effect on sheep farming under arid environment. Abiotic stress management for resilient. Agriculture. Singapore: Springer; 2017. pp. 455-474. DOI: 10.1007/978-981-10-5744-1_22
  32. 32. Morris K, Reich P. Understanding the relationship between livestock grazing and wetland condition. In: Arthur Rylah Institute for Environmental Research Technical Report Series. No. 252. Heidelberg, Victoria: Department of Environment and Primary Industry; 2013. p. 252
  33. 33. Wassie SB. Natural resource degradation tendencies in Ethiopia: A review. Environmental Systems Research. 2020;1:1-29
  34. 34. Hinch GN. Understanding the natural behaviour of sheep. In: Advances in Sheep Welfare. Sawston, UK: Woodhead Publishing Series in Food Science, Technology and Nutrition; 2017. pp. 1-15. DOI: 10.1016/B978-0-08-100718-1.00001-7
  35. 35. Van Wettere WH, Kind KL, Gatford KL, Swinbourne AM, Leu ST, Hayman PT, et al. Review of the impact of heat stress on reproductive performance of sheep. Journal of Animal Science and Biotechnology. 2021;12:1-8
  36. 36. Dwyer C. Reproductive management (including impacts of prenatal stress on offspring development). In: Advances in Sheep Welfare. Sawston, UK: Woodhead Publishing Series in Food Science, Technology and Nutrition; 2017. pp. 131-152. DOI: 10.1016/B978-0-08-100718-1.00007-8
  37. 37. Webster J. Animal Welfare: Limping towards Eden: A Practical Approach to Redressing the Problem of our Dominion over the Animals. John Wiley & Sons; 2008
  38. 38. Colditz IG. Effects of the immune system on metabolism: Implications for production and disease resistance in livestock. Livestock Production Science. 2002;75(3):257-268. DOI: 10.1016/S0301-6226(01)00320-7
  39. 39. Tufekci H, Sejian V. Stress factors and their effects on productivity in sheep. Animals. 2023;13(17):2769
  40. 40. Hoffmann I. Adaptation to climate change–exploring the potential of locally adapted breeds. Animal. 2013;7(s2):346-362
  41. 41. Squires VR. Ecology and behaviour of domestic sheep (Ovis aries): A review. Mammal Review. 1975;5(2):35-57
  42. 42. Hiernaux P, Dardel C, Kergoat L, Mougin E. Desertification, adaptation and resilience in the Sahel: Lessons from long term monitoring of agro-ecosystems. In: The End of Desertification? Disputing Environmental Change in the Drylands. Berlin, Heidelberg: Springer-Verlag; 2016. pp. 147-178
  43. 43. George W, Zoltan B, Andras J, Szilvia K. Impacts of climate change on sheep genetic diversity: A review. Natural Resources and Sustainable Development. 2020;10(2):240-261
  44. 44. Altizer S, Bartel R, Han BA. Animal migration and infectious disease risk. Science. 2011;331(6015):296-302
  45. 45. Kiss IZ, Green DM, Kao RR. The network of sheep movements within Great Britain: Network properties and their implications for infectious disease spread. Journal of the Royal Society Interface. 2006;3(10):669-677
  46. 46. Gann GD, McDonald T, Walder B, Aronson J, Nelson CR, Jonson J, et al. International principles and standards for the practice of ecological restoration. Restoration Ecology. 2019;27(S1):S1-S46
  47. 47. Festa-Bianchet M. The social system of bighorn sheep: Grouping patterns, kinship and female dominance rank. Animal Behaviour. 1991;42(1):71-82
  48. 48. Dwyer CM. How has the risk of predation shaped the behavioural responses of sheep to fear and distress? Animal Welfare. 2004;13(3):269-281
  49. 49. Ward A, Webster M. Sociality: The Behaviour of Group-Living Animals. Berlin, Germany: Springer; 2016. p. 407
  50. 50. Berger DJ, German DW, John C, Hart R, Stephenson TR, Avgar T. Seeing is be-leaving: Perception informs migratory decisions in Sierra Nevada bighorn sheep (Ovis canadensis sierrae). Frontiers in Ecology and Evolution. 2022;10:742275
  51. 51. di Virgilio A, Morales JM. Towards evenly distributed grazing patterns: Including social context in sheep management strategies. London, UK: Peer J Publishing; 2016;4:e2152
  52. 52. Buchalski MR, Navarro AY, Boyce WM, Vickers TW, Tobler MW, Nordstrom LA, et al. Genetic population structure of peninsular bighorn sheep (Ovis canadensis nelsoni) indicates substantial gene flow across US–Mexico border. Biological Conservation. 2015;184:218-228
  53. 53. Salem HB, Smith T. Feeding strategies to increase small ruminant production in dry environments. Small Ruminant Research. 2008;77(2-3):174-194
  54. 54. Joy A, Dunshea FR, Leury BJ, Clarke IJ, DiGiacomo K, Chauhan SS. Resilience of small ruminants to climate change and increased environmental temperature: A review. Animals. 2020;10(5):867
  55. 55. Liddell CL. Behavioural response of sheep to forage resources and parasite risk in an extensive grazing system [doctoral dissertation]; University of Bristol. 2021
  56. 56. Curio E. The Ethology of Predation. Berlin, Germany: Springer Science & Business Media; 1976;7:1-250
  57. 57. Huntingford FA, Turner AK, Dowine LM. Animal Conflict. Chapman & Hall Animal Behaviour Series. Dordrecht: Springer; 2013. pp. 1-448. DOI: 10.1007/978-94-009-3145-9
  58. 58. Spitz DB. Does Migration Matter? Causes and Consequences of Migratory Behavior in Sierra Nevada Bighorn Sheep. Graduate Student Theses, Dissertations, & Professional Papers. University of Montana: ProQuest LLC; 2015. pp. 1-166, 10793. Available from: https://scholarworks.umt.edu/etd/10793
  59. 59. Lia-Rognli E, Nummedal SA. Sheep and predator interactions: An investigation into the behavioural patterns of sheep during attacks and the feasibility of predictive modelling using GPS data [Master's thesis]; NTNU. 2023
  60. 60. Fuller A, Mitchell D, Maloney SK, Hetem RS. Towards a mechanistic understanding of the responses of large terrestrial mammals to heat and aridity associated with climate change. Climate Change Responses. 2016;3:1-9
  61. 61. Flesch AD, Epps CW, Cain JW III, Clark M, Krausman PR, Morgart JR. Potential effects of the United States-Mexico border fence on wildlife. Conservation Biology. 2010;24(1):171-181
  62. 62. Drent RH, Eichhorn G, Flagstad A, Van der Graaf AJ, Litvin KE, Stahl J. Migratory connectivity in Arctic geese: Spring stopovers are the weak links in meeting targets for breeding. Journal of Ornithology. 2007;148:501-514
  63. 63. Braczkowski A, Fattebert J, Schenk R, O'Bryan C, Biggs D, Maron M. Evidence for increasing human-wildlife conflict despite a financial compensation scheme on the edge of a Ugandan National Park. Conservation Science and Practice. 2020;2(12):e309
  64. 64. Abrahms B, Carter NH, Clark-Wolf TJ, Gaynor KM, Johansson E, McInturff A, et al. Climate change as a global amplifier of human–wildlife conflict. Nature Climate Change. 2023;13(3):224-234
  65. 65. Bett B, Kiunga P, Gachohi J, Sindato C, Mbotha D, Robinson T, et al. Effects of climate change on the occurrence and distribution of livestock diseases. Preventive Veterinary Medicine. 2017;137:119-129
  66. 66. Ahmad Pampori Z, Ahmad Sheikh A, Aarif O, Hasin D, Ahmad BI. Physiology of reproductive seasonality in sheep–an update. Biological Rhythm Research. 2020;51(4):586-598
  67. 67. Joshi P. Nutrition and reproduction in sheep. Food & Agribusiness Management (FABM). 2022;3(2):48-52
  68. 68. Naqvi SM, Kumar D, Paul RK, Sejian V. Environmental stresses and livestock reproduction. Environmental Stress and Amelioration in Livestock Production. Berlin, Heidelberg: Springer; 2012. pp. 97-128. DOI: 10.1007/978-3-642-29205-7_5
  69. 69. Gootwine E. Genetics and breeding of sheep and goats. In: Animal Agriculture. Elsevier, Academic Press; 2020. pp. 183-198. DOI: 10.1016/B978-0-12-817052-6.00010-0
  70. 70. Belliggiano A, Bindi L, Ievoli C. Walking along the sheeptrack… rural tourism, ecomuseums, and bio-cultural heritage. Sustainability. 2021;13(16):8870
  71. 71. Turner MD, Williams TO. Livestock market dynamics and local vulnerabilities in the Sahel. World Development. 2022;30(4):683-705
  72. 72. Dyson-Hudson R, Dyson-Hudson N. Nomadic pastoralism. Annual Review of Anthropology. 1980;9(1):15-61
  73. 73. Steimann B. Conflicting strategies for contested resources: Pastoralists’ responses to uncertainty in post-socialist rural Kyrgyzstan. In: Pastoral Practices in High Asia: Agency of 'development' Effected by Modernisation, Resettlement and Transformation. Dordrecht: Springer; 2012. pp. 145-160
  74. 74. Sharifian A, Fernandez-Llamazares A, Wario HT, Molnar Z, Cabeza M. Dynamics of pastoral traditional ecological knowledge: A global state-of-the-art review. Ecology and Society. 2022;27(1):14
  75. 75. Masters DG, Blache D, Lockwood AL, Maloney SK, Norman HC, Refshauge G, et al. Shelter and shade for grazing sheep: Implications for animal welfare and production and for landscape health. Animal Production Science. 2023;63(7):623-644
  76. 76. Manjunathareddy GB, Sajjanar B, Sejian V. Impact of climate change on sheep disease occurrences and its management. Sheep Production Adapting to Climate Change. 2017:197-207
  77. 77. Estevez I, Andersen IL, Naevdal E. Group size, density and social dynamics in farm animals. Applied Animal Behaviour Science. 2007;103(3-4):185-204
  78. 78. Cooke SJ, Galassi DM, Gillanders BM, Landsman SJ, Hammerschlag N, Gallagher AJ, et al. Consequences of “natural” disasters on aquatic life and habitats. Environmental Reviews. 2022;31(1):122-140
  79. 79. Cockram MS. A review of behavioural and physiological responses of sheep to stressors to identify potential behavioural signs of distress. Animal Welfare. 2004;13(3):283-291
  80. 80. Ramya S, Poornima P, Jananisri A, Geofferina IP, Bavyataa V, Divya M, et al. Role of hormones and the potential impact of multiple stresses on infertility. Stress. 2023;3(2):454-474
  81. 81. Brien FD, Cloete SW, Fogarty NM, Greeff JC, Hebart ML, Hiendleder S, et al. A review of the genetic and epigenetic factors affecting lamb survival. Animal Production Science. 2014;54(6):667-693
  82. 82. Basile F, Capaccia C, Zampini D, Biagetti T, Diverio S, Guelfi G. Omics insights into animal resilience and stress factors. Animals. 2020;11(1):47
  83. 83. Ramseyer A, Boissy A, Thierry B, Dumont B. Individual and social determinants of spontaneous group movements in cattle and sheep. Animal. 2009;3(9):1319-1326
  84. 84. Rohwer S. The social significance of avian winter plumage variability. Evolution. Oxford: Oxford University Press; 1975;29(4):593-610
  85. 85. Pandey LN, Gyawali R. Constraints and potential of goat and sheep production under transhumance management system in the high mountainous regions of Nepal. In: Conference: Research and Development Strategies for Goat Enterprises in Nepal. Kathmandu, Nepal, Kanibahal, Lalitpur: Siddartha Printing Press; 2013. pp. 92-101
  86. 86. Van Dijk JG, Matson KD. Ecological immunology through the lens of exercise immunology: New perspective on the links between physical activity and immune function and disease susceptibility in wild animals. Integrative and Comparative Biology. 2016;56(2):290-303
  87. 87. Valdez R, Krausman PR. Mountain Sheep of North America. Tucson: University of Arizona Press; 1999. pp. 1-353
  88. 88. Gregory NG. Physiology and Behaviour of Animal Suffering. Oxford, UK, Ames, Iowa: Wiley-Blackwell Science; 2008. pp. 1-268. DOI: 10.1002/9780470752494
  89. 89. Michelena P, Gautrais J, Gerard JF, Bon R, Deneubourg JL. Social cohesion in groups of sheep: Effect of activity level, sex composition and group size. Applied Animal Behaviour Science. 2008;112(1-2):81-93
  90. 90. Misra AK. Climate change and challenges of water and food security. International Journal of Sustainable Built Environment. 2014;3(1):153-165
  91. 91. Gionfriddo JP. Summer Habitat Use by Mountain Sheep. Tucson: The University of Arizona Press; 1984. pp. 1-37. Available from: http://hdl.handle.net/10150/275221
  92. 92. Behnke RH, Fernandez- Gimenez ME, Turner MD, Stammler F. Pastoral migration: Mobile systems of livestock husbandry. In: Milner-Gulland EJ, Fryxell J, Sinclair ARE, editors. Animal Migration–A Synthesis. Oxford: Oxford University Press; 2011. pp. 144-171
  93. 93. Wolanski E, Gereta E, Borner M, Mduma S. Water, migration and the Serengeti ecosystem. American Scientist. 1999;87:526-533
  94. 94. DeCesare NJ, Pletscher DH. Movements, connectivity, and resource selection of Rocky Mountain bighorn sheep. Journal of Mammalogy. 2006;87(3):531-538
  95. 95. Serranito B, Cavalazzi M, Vidal P, Taurisson-Mouret D, Ciani E, Bal M, et al. Local adaptations of Mediterranean sheep and goats through an integrative approach. Scientific Reports. 2021;11(1):21363
  96. 96. Wilcove DS. No Way Home: The Decline of the World's Great Animal Migrations. Wasbington, London: Island Press; 2008. pp. 1-123
  97. 97. Said MY, Ogutu JO, Kifugo SC, Makui O, Reid RS, de Leeuw J. Effects of extreme land fragmentation on wildlife and livestock population abundance and distribution. Journal for Nature Conservation. 2016;34:151-164
  98. 98. Kumar R, Kumar A, Saikia P. Deforestation and forests degradation impacts on the environment. In: Environmental Degradation: Challenges and Strategies for Mitigation. Cham: Springer International Publishing; 2022. pp. 19-46
  99. 99. Frid A, Dill L. Human-caused disturbance stimuli as a form of predation risk. Conservation Ecology. 2002;6(1):11
  100. 100. Karakus F. Weaning stress in lambs. Journal of International Scientific Publications: Agriculture & Food. 2014;2:165-170
  101. 101. Mora-Medina P, Mota-Rojas D, Arch-Tirado E, Orozco-Gregorio H. Animal Welfare in Lambs: Ewe-Lamb Separation. Large Animal Review. 2015. pp. 39-44
  102. 102. Dodd CL, Pitchford WS, Edwards JEH, Hazel SJ. Measures of behavioural reactivity and their relationships with production traits in sheep: A review. Applied Animal Behaviour Science. 2012;140(1-2):1-15
  103. 103. Endris M, Feki E. Review on effect of stress on animal productivity and response of animal to stressors. Journal of Animal Veterinary Advances. 2021;20(1):1-14
  104. 104. Cook CJ. Oxytocin and prolactin suppress cortisol responses to acute stress in both lactating and non-lactating sheep. Journal of Dairy Research. 1997;64(3):327-339
  105. 105. Savage K. Sheep-Work: Food Empires and Pastoral Resistance in the Intermountain West. [Master Thesis]. Salt Lake City, UT: The University of Utah; 2010. pp. 1-56
  106. 106. Hoare B. Animal Migration: Remarkable Journeys in the Wild. Berkeley: University of California Press; 2009. pp. 1-176
  107. 107. McKenna E. Livestock: Food, Fiber, and Friends. Athens, Georgia: University of Georgia Press; 2018. pp. 1-53
  108. 108. Bhatt N, Singh NP, Mishra AK, Kandpal D, Jamwal S. A detailed review of transportation stress in livestock and its management techniques. International Journal of Livestock Research. 2021;11(1):30-41
  109. 109. Caminade C, McIntyre KM, Jones AE. Impact of recent and future climate change on vector-borne diseases. Annals of the New York Academy of Sciences. 2019;1436(1):157-173
  110. 110. Broom DM, Kirkden RD. Welfare, stress, behaviour and pathophysiology. In: Veterinary Pathophysiology. Ames, Iowa: Blackwell; 2004. pp. 337-369
  111. 111. Bianchi RM, Panziera W, Faccin TC, Almeida GLD, Cargnelutti JF, Flores EF, et al. Clinical, pathological and epidemiological aspects of outbreaks of bluetongue disease in sheep in the central region of Rio Grande do Sul. Pesquisa Veterinária Brasileira. 2017;37:1443-1452
  112. 112. Morgante M. Digestive disturbances and metabolic-nutritional disorders. In: Dairy Sheep Nutrition. Wallingford UK: CABI Publishing; 2004. pp. 165-190
  113. 113. Yadav N, Upadhyay RK. Global effect of climate change on seasonal cycles, vector population and rising challenges of communicable diseases: A review. Journal of Atmospheric Science Research. 2023;6(1):21-59
  114. 114. Broom DM. Transport stress in cattle and sheep with details of physiological, ethological and other indicators. Deutsche Tierarztliche Wochenschrift. 2003;110(3):83-88
  115. 115. Tort L, Teles M. The endocrine response to stress-a comparative view. In: Basic and Clinical Endocrinology Up-to-date. London, UK: IntechOpen; 2011. pp. 263-286
  116. 116. Todini L. Thyroid hormones in small ruminants: Effects of endogenous, environmental and nutritional factors. Animal. 2007;1(7):997-1008
  117. 117. Jackson EK. Vasopressin and other agents affecting the renal conservation of water. In: Goodman & Gilmans. The Pharmaological Basis of Therapeutics. 11th ed. New York: McGraw Hill; 2006. pp. 771-788
  118. 118. Sun Q , Dimopoulos G, Nguyen DN, Tu Z, Nagy N, Hoang AD, et al. Low-dose vasopressin in the treatment of septic shock in sheep. American Journal of Respiratory and Critical Care Medicine. 2003;168(4):481-486
  119. 119. Muhammad M, Stokes JE, Manning L. Positive aspects of welfare in sheep: Current debates and future opportunities. Animals. 2022;12(23):3265
  120. 120. Walker SC, McGlone FP. The social brain: Neurobiological basis of affiliative behaviours and psychological well-being. Neuropeptides. 2013;47(6):379-393
  121. 121. Sutherland MA, Worth GM, Dowling SK, Lowe GL, Cave VM, Stewart M. Evaluation of infrared thermography as a non-invasive method of measuring the autonomic nervous response in sheep. PLoS One. 2020;15(5):e0233558
  122. 122. Gilbert-Gregory S. Sensory and perception. Introduction to Animal Behavior and Veterinary Behavioral Medicine. Hoboken, New Jersey: John Wiley & Sons, Inc; 2024. pp. 65-89
  123. 123. Xiao J, Guo W, Han Z, Xu Y, Xing Y, Phillips CJ, et al. The effects of housing on growth, immune function and antioxidant status of young female lambs in cold conditions. Animals. 2024;14(3):518
  124. 124. Bradford BJ, Contreras GA. Adipose tissue inflammation: Linking physiological stressors to disease susceptibility. Annual Review of Animal Biosciences. 2024;12(1):261-281
  125. 125. Li B, Wu K, Duan G, Yin W, Lei M, Yan Y, et al. Folic acid and taurine alleviate the impairment of redox status, immunity, rumen microbial composition and fermentation of lambs under heat stress. Animals. 2024;14(7):998
  126. 126. de Jong IE, Wells RG. In utero extrahepatic bile duct damage and repair: Implications for biliary atresia. Society for Pediatric and Developmental Pathology. 2024. DOI: 10.1177/10935266241247479
  127. 127. Hua KXQ , Peng Y, Sun Y, He R, Luo R, Jin H. The role of hormones in the regulation of lactogenic immunity in porcine and bovine species. Domestic Animal Endocrinology. 2024;88:106851
  128. 128. Zhang R, Wei M, Zhou J, Yang Z, Xiao M, Du L, et al. Effects of organic trace minerals chelated with oligosaccharides on growth performance, blood parameters, slaughter performance and meat quality in sheep. Frontiers in Veterinary Science. 2024;11:1366314
  129. 129. Oldham L. Affective and Cognitive Components of Agonistic Behaviour in Pigs: Implications for Animal Welfare and Social Behaviour. Edinburgh, UK: The University of Edinburgh; 2024. pp. 1-257
  130. 130. Hassan LM, Omer EA. Review Sudan’s Sheep Production: Limitations and Prospects. IntechOpen; 2024. pp. 1-19. DOI: 10.5772/intechopen.114158
  131. 131. Houpt KA. Domestic Animal Behavior for Veterinarians and Animal Scientists. 7th edition. Hoboken, New Jersey, United States: Wiley-Blackwell; 2024. pp. 1-496
  132. 132. Ibrahim A, Ngadiyono N, Maulana H, Atmoko BA. Effect of shearing on thermo-physiological, behavior, and productivity traits of two Indonesian local sheep breeds. Tropical Animal Science Journal. 2024;47(1):42-52
  133. 133. Davies KL, Miles J, Camm EJ, Smith DJ, Barker P, Taylor K, et al. Prenatal cortisol exposure impairs adrenal function but not glucose metabolism in adult sheep. Journal of Endocrinology. 2024;260:e230326
  134. 134. Saroha V. Developmental programming of the cell stress response and metabolic inflammation in liver and adipose tissue in an ovine model [doctoral dissertation]; University of Nottingham. 2017
  135. 135. Hyder I, Ravi Kanth Reddy P, Raju J, Manjari P, Srinivasa Prasad C, Aswani Kumar K, et al. Alteration in rumen functions and diet digestibility during heat stress in sheep. Sheep Production Adapting to Climate Change. Singapore: Springer; 2017. pp. 235-265
  136. 136. Destrez A, Deiss V, Leterrier C, Calandreau L, Boissy A. Repeated exposure to positive events induces optimistic-like judgment and enhances fearfulness in chronically stressed sheep. Applied Animal Behaviour Science. 2014;154:30-38
  137. 137. Brien FD, Cloete SWP, Fogarty NM, Greeff JC, Hebart ML, Hiendleder S, et al. A review of the genetic and epigenetic factors affecting lamb survival. Animal Production Science. 2014;54(6):667-693
  138. 138. Leite JHGM, Da Silva RG, Asensio LAB, de Sousa JER, da Silva WST, da Silva WE, et al. Coat color and morphological hair traits influence on the mechanisms related to the heat tolerance in hair sheep. International Journal of Biometeorology. 2020;64:2185-2194
  139. 139. Gowane GR, Gadekar YP, Prakash V, Kadam V, Chopra A, Prince LLL. Climate change impact on sheep production: Growth, milk, wool, and meat. Sheep Production Adapting to Climate Change. Singapore: Springer; 2017. pp. 31-69
  140. 140. Pantoja MHDA. Thermoregulation responses in sheep: A cellular approach [doctoral dissertation]; Universidade de Sao Paulo. 2022
  141. 141. Skarpe C, Hester AJ. Plant traits, browsing and gazing herbivores, and vegetation dynamics. Ecological Studies. 2008;195:217
  142. 142. Rahmann G, Seip H. Alternative management strategies to prevent and control endo-parasite diseases in sheep and goat farming systems–A review of the recent scientific knowledge. Land Bauforschung Volkenrode. 2007;2:75-88

Written By

Vinod Bhateshwar, Basant Kumar Bhinchhar, Hitesh Muwal and Paramveer Palriya

Submitted: 02 July 2024 Reviewed: 16 July 2024 Published: 28 May 2025