CLIMATE CHANGE AND ITS IMPACT ON DAIRY SECTOR: ADAPTATION STRATEGIES

CLIMATE CHANGE AND ITS IMPACT ON DAIRY SECTOR: ADAPTATION STRATEGIES

Ms. Snekha C.*¹, Dr. Mervin Kennady R.V.², Dr. Thirumurthi K.³, Dr. Veeramalla Divya⁴

¹ MBA scholar, Department of Agribusiness Management, ICAR -IVRI, Izatnagar, Bareilly

Email ID: snekha.mba.ivri@gmail.com; ORCID:0009-0008-5189-0863

² MVSc Scholar, Division of Virology, ICAR-Indian Veterinary Research Institute, Mukteswar, Nainital, Uttarakhand, India. Email: mervinkennady@gmail.com; ORCID iD: 0009-0007-6686-7773

³ MVSc Scholar, Division of Veterinary Microbiology, ICAR–Indian Veterinary Research Institute, Izatnagar–243122, Bareilly, Uttar Pradesh, India. Email: zackthiru200151@gmail.com; ORCID: 0009-0004-2798-7324

⁴ MVSc Scholar, Division of Virology, ICAR-Indian Veterinary Research Institute, Mukteswar, Nainital, Uttarakhand, India. Email: divyareddyveeramalla@gmail.com; ORCID iD: 0009-0007-3168-9946

*Corresponding Author: snekha.mba.ivri@gmail.com

ABSTRACT

Global dairy production systems confront unprecedented challenges from accelerating climate change, manifested through heat stress, water scarcity, altered forage productivity, and emerging disease patterns. This comprehensive review synthesizes contemporary scientific evidence from thirty peer-reviewed research articles to assess climate impacts on dairy production and evaluate effectiveness of adaptation strategies. Rising temperatures reduce milk production through physiological stress and decreased feed intake, with economic losses exceeding $1.5 billion annually in developed nations and disproportionately affecting smallholder producers in developing regions. Water availability constraints intensify feed insecurity, particularly during drought periods. Simultaneously, climate-driven changes in disease epidemiology expand geographic ranges of vector-borne and infectious diseases affecting cattle. Effective adaptation encompasses technological innovations including genetic selection for heat tolerance, precision feeding systems responsive to thermal stress conditions, improved water management through rainwater harvesting and efficient irrigation, renewable energy integration, and enhanced cooling infrastructure. Breeding programs targeting slick-hair coat genes and genomic selection offer accelerated gains in thermotolerance. Simultaneously, supportive policy environments, farmer access to credit and information services, agricultural insurance mechanisms, and institutional capacity building prove essential for scaled adaptation implementation. Evidence indicates that integrated, multi-level approaches combining genetic, nutritional, infrastructural, and institutional adaptations substantially mitigate climate impacts while maintaining production sustainability and farmer livelihoods.

Keywords: climate change, dairy cattle, heat stress, temperature-humidity index, adaptation strategies, genetic selection, water management, feed security

1. INTRODUCTION

The dairy sector constitutes a fundamental component of global food systems, contributing substantially to nutritional security and rural livelihoods in both developed and developing nations. Global milk production now exceeds 900 million metric tons annually, providing essential protein, calcium, and micronutrients to billions of people worldwide. However, this critical sector confronts escalating challenges from anthropogenic climate change, which threatens production systems through multiple interconnected pathways. Contemporary climate science demonstrates that global mean temperatures are rising at approximately 0.18°C per decade, with projections indicating continued warming of 1.5 to 4.5°C by 2100 depending on emissions scenarios. For dairy production systems, temperature increases of this magnitude translate into substantial production losses, compromised animal welfare, and economic pressures on farm viability.

Climate impacts on dairy operations manifest through multiple interconnected mechanisms. Thermal stress directly compromises physiological performance and reduces feed intake in lactating dairy cattle. Simultaneously, changing precipitation patterns and extended drought periods diminish forage availability and alter nutritional composition of pastures. Climate-driven changes in temperature and moisture regimes fundamentally alter epidemiology and geographic distribution of livestock diseases, with warming temperatures expanding ranges of arthropod vectors into previously unsuitable regions. Water scarcity intensifies operational pressures, particularly for production and cleaning. These multidimensional challenges prove especially acute for smallholder dairy farmers in tropical and subtropical regions, who typically lack infrastructure and capital necessary for technological adaptations. Despite these formidable challenges, contemporary research demonstrates that well-designed, science-based adaptation strategies substantially reduce climate vulnerability while maintaining or improving production sustainability.

This review synthesizes contemporary scientific evidence from thirty peer-reviewed research articles to provide comprehensive assessment of climate change impacts on dairy production systems and to evaluate effectiveness of diverse adaptation strategies. The analysis encompasses studies from diverse geographic regions and production systems, including intensive industrial operations in temperate zones and pastoral systems in developing countries. Particular attention focuses on mechanisms through which climate variables influence dairy production, evidence-based adaptation strategies with demonstrated effectiveness, and enabling institutional and policy frameworks facilitating scaled adaptation implementation. Collectively, this evidence base demonstrates that although climate change poses substantial challenges to dairy sustainability, multiple pathways exist for enhancing resilience through technological innovation, improved management practices, and supportive institutional environments.

1. CLIMATE CHANGE IMPACTS ON DAIRY PRODUCTION SYSTEMS
2. Thermal stress and milk production losses

Heat stress constitutes the most quantifiable climate impact on dairy production, with measurable effects on physiology, production performance, and animal welfare. Lactating dairy cattle exhibit exceptional vulnerability to thermal stress due to exceptionally high metabolic rates associated with milk synthesis. Temperature-humidity index (THI) represents the standardized approach for quantifying heat stress, combining dry-bulb temperature and relative humidity to generate a comprehensive thermal stress metric. Research documents that when THI exceeds critical thresholds—typically ranging from 68 to 74 depending on breed and management system—dairy cattle experience progressive physiological stress characterized by elevated respiration rates, enhanced sweating, and elevated core body temperature. Studies examining milk production responses demonstrate that each unit increase in THI above critical thresholds results in approximately 0.2 to 0.5 kg reduction in daily milk yield. In a comprehensive controlled-climate study, heat-susceptible Holstein cows exhibited milk production declines of 25-35% during moderate heat stress periods, whereas heat-tolerant genotypes experienced losses of only 10-15%, demonstrating substantial genetic variation in heat sensitivity. Beyond production volume, thermal stress compromises milk composition, reducing casein concentration and altering fatty acid profiles, which significantly impacts processing suitability for cheese and dairy product manufacture.

Reproductive consequences of heat stress prove equally significant as production losses. Elevated ambient temperatures impair reproductive function through multiple mechanisms, including altered estrous expression, prolonged estrous cycles, reduced conception rates, and increased embryonic loss. Studies from heat-stressed herds document that conception rates decline by 15-30% during periods when daily maximum temperatures exceed 32°C. Furthermore, heat stress suppresses immune function through stress hormone elevation and direct thermal damage to immune cells, increasing susceptibility to infection and mastitis. Economic analyses indicate that heat stress-induced losses in United States dairy operations exceed $1.5 billion annually, with losses concentrated during summer months. For developing countries with less developed cooling infrastructure, proportional economic impacts appear even more severe relative to farmer asset bases.

2. Water availability and forage security

Climate change fundamentally alters hydrological regimes through shifts in precipitation timing, intensity, and spatial distribution. For dairy production systems, these hydrological changes create coupled challenges of reduced water availability and diminished forage productivity. Pasture-based dairy systems, which provide nutrition for approximately 60% of global dairy cattle, depend upon seasonal precipitation patterns refined over generations of agricultural practice. Climate-induced modifications of these patterns create cascading consequences for feed availability and nutritional quality. Empirical studies from drought-prone regions document that each year of below-normal precipitation reduces pasture productivity by 15-25%, forcing farmers to supplement purchased feeds at substantially elevated costs. In regions of East Africa, analysis of rainfall patterns over recent decades reveals increasing interannual variability, with both extended drought periods and intense precipitation events becoming more frequent. Nutritional analyses indicate that drought stress reduces forage protein content by 8-12% while increasing fiber concentration, diminishing nutritional value independent of quantity changes. Heat stress compounds forage production challenges by increasing evapotranspiration rates and reducing soil water availability. Research demonstrates that combined effects of elevated temperatures and altered precipitation reduce forage dry matter yields by 20-35% in vulnerable agroecological zones.

Water scarcity for animal consumption adds direct production constraints. Dairy cattle typically require 50-60 liters of drinking water daily under thermoneutral conditions, with requirements increasing to 80-100 liters during heat stress as evaporative cooling demands escalate. Water scarcity forces difficult management decisions, including herd size reductions or relocation, with associated losses of production capacity and farmer income. Furthermore, water required for milking hygiene, cooling milk, and cleaning facilities increases operational pressures during water shortage periods. In regions dependent upon groundwater, climate-induced declines in water tables threaten sustainability of dairy operations.

3. Climate-driven disease emergence and epidemiological shifts

Climate change profoundly modifies disease dynamics through direct effects on pathogen replication and survival and indirect effects on vector ecology and geographic distribution. Vector-borne diseases, transmitted by arthropods including ticks, flies, and mosquitoes, demonstrate particularly acute sensitivity to climatic variables. Temperature directly influences vector development rates, survival durations, and pathogen replication within vectors. Research demonstrates that temperature increases of 1-2°C can substantially reduce pathogen incubation periods within vectors, enabling faster disease transmission. Increasing temperatures enable tick populations to survive at previously unsuitable higher latitudes and altitudes, expanding geographic ranges of tick-borne diseases. As evidence, the cattle tick Rhipicephalus microplus, responsible for babesiosis and anaplasmosis transmission, has expanded northward in South America and into higher altitude regions previously free from this vector. Similarly, bluetongue virus, previously restricted to tropical and subtropical regions, has emerged in northern Europe and Mediterranean regions, coinciding with temperature increases and range expansion of Culicoides vector species. Simultaneously, humidity increases associated with altered precipitation patterns expand habitat suitability for numerous arthropod vectors.

Heat stress further exacerbates disease susceptibility through immunosuppression. Elevated cortisol concentrations during thermal stress suppress lymphocyte proliferation and reduce antibody titers, diminishing immune competence. Studies document that heat-stressed dairy cattle exhibit 20-30% reductions in circulating neutrophil function and reduced resistance to mastitis-causing bacteria. This immunosuppression coincides with expanded vector populations and altered disease dynamics, creating a double burden for affected herds. Mastitis incidence increases substantially during summer months in association with heat stress, humid conditions favoring pathogenic bacteria proliferation, and immune suppression. Economic analyses indicate that heat stress-associated mastitis increases treatment costs and milk losses substantially, affecting farm profitability beyond direct heat stress production losses.

III. ADAPTATION STRATEGIES AND TECHNOLOGICAL SOLUTIONS

1. Genetic selection and breeding for thermotolerance

Selective breeding represents a fundamental long-term adaptation strategy, conferring permanent genetic improvements heritable to subsequent generations. Heat tolerance itself constitutes a heritable trait, demonstrating substantial additive genetic variance enabling directed selection. Tropically-adapted cattle breeds exhibit superior thermal tolerance compared to temperate-origin breeds through multiple physiological mechanisms, including altered coat characteristics, enhanced sweating ability, and superior thermoregulatory capacity. Contemporary breeding research has identified the ‘slick hair’ phenotype, originating from Senepol cattle indigenous to Saint Croix island, as conferring exceptional heat tolerance. The slick-hair trait involves shortened, glossy coat reducing heat absorption and enhancing evaporative cooling efficiency. Molecular studies reveal that this trait is controlled by a dominant allele located on chromosome 20, likely involving prolactin receptor genes regulating coat characteristics. Remarkably, animals heterozygous for this allele (possessing single copy) exhibit 70-80% of the thermotolerance benefit of homozygous animals, enabling rapid dissemination through crossbreeding programs. Studies demonstrate that Holstein cows carrying the slick-hair allele maintain relatively constant milk production across seasons, whereas production of non-slick Holsteins declines 25-35% during peak summer months.

Contemporary genomic selection technologies dramatically accelerate genetic gains for heat tolerance without requiring multi-generational progeny testing. Genomic selection utilizes genome-wide DNA markers capturing effects of thousands of genetic variants, enabling selection decisions on young animals before reproductive maturity. Research demonstrates that genomic selection can achieve two to three-fold acceleration of genetic gain compared to conventional pedigree-based selection. Several countries, including Australia, United States, and Puerto Rico, have implemented genomic selection for heat tolerance in dairy cattle, with carriers of favorable heat-tolerance genomic predictions showing measurably improved performance under heat stress. Additionally, gene-editing technologies offer unprecedented opportunities for direct introgression of favorable alleles, such as the slick-hair variant, potentially achieving in one or two generations what would require five to ten generations through conventional breeding. These technologies must be deployed responsibly with careful evaluation of potential negative pleiotropic effects and societal acceptability.

2. Nutritional management and precision feeding systems

Heat stress creates a fundamental nutritional paradox: animals simultaneously experience increased nutrient requirements for maintenance and stress metabolism while reducing feed intake due to reduced appetite. Precision feeding systems developed based on contemporary understanding of heat stress physiology can partially mitigate this paradox through strategic nutrient supplementation. Heat-stressed cattle require increased potassium intake to maintain electrolyte balance, with supplementation from 0.8% to 1.2% of diet dry matter recommended during thermal stress periods. Similarly, calcium requirements increase due to enhanced urinary losses, and chromium supplementation shows promise for improving glucose metabolism. Amino acid profiles shift under heat stress, with increased requirements for methionine and lysine. Total mixed ration (TMR) feeding systems, providing precisely formulated nutrient combinations, prove superior to pasture-only systems for maintaining production during heat stress. Research demonstrates that heat-stressed cows receiving precision-formulated TMR experience only 10-15% production losses, whereas comparable animals on pasture alone experience 25-35% declines. Furthermore, strategic use of energy-dense feeds including vegetable oils and high-starch supplements increases energy density of diets, enabling adequate energy intake despite reduced overall feed consumption.

Climate-resilient forage production systems provide the foundation for sustainable dairy production. Diversification of forage species, incorporating drought-tolerant cultivars and multipurpose tree species, builds system resilience through extended supply periods. Improved fodder conservation through ensiling, hay production, and supplementary feed manufacturing ensures adequate nutrition during predicted feed-shortage periods. Agroforestry integration combining fodder trees with crop production provides nutritional resilience while building soil carbon content and reducing erosion. In East African pastoral systems, integration of drought-tolerant legume crops including improved sesbania and pigeon pea provides high-quality protein sources during dry seasons. Total food security for dairy cattle requires integrated forage and supplement strategies, with improved pasture management, fodder conservation, and purchased concentrate supplies working synergistically.

3. Water management and cooling infrastructure

Strategic water management simultaneously addresses water scarcity and heat stress mitigation. Rainwater harvesting systems capturing seasonal precipitation provide buffering capacity for dry season water demands. Seasonal storage facilities including earthen ponds and underground cisterns preserve water captured during wet periods for use during dry seasons. Efficient irrigation systems including drip irrigation and micro-irrigation reduce water consumption 40-60% compared to conventional flood irrigation while maintaining or enhancing forage production. Recycling of water used for milk cooling and facility cleaning reduces freshwater requirements, with recycled water suitable for irrigation or livestock watering after appropriate treatment. Research from dairy farms implementing comprehensive water management achieves 30-50% reductions in freshwater consumption while improving forage productivity and production stability.

Cooling technologies directly mitigate heat stress impacts on animal performance. Sprinkler and misting systems applied during peak thermal stress periods reduce body temperature and improve milk production. Research demonstrates that evaporative cooling systems reduce heat stress severity and partially recover production losses, with effectiveness depending upon ambient humidity. In arid climates with low humidity, evaporative cooling systems prove highly effective, reducing heat stress impacts by 20-30%. In humid tropical climates, forced ventilation systems utilizing ceiling or wall fans enhance air circulation and evaporative cooling effectiveness. Shade structures, whether natural (trees) or constructed (shade cloth), reduce direct solar radiation and provide measurable heat stress mitigation. Optimal heat stress mitigation combines multiple technologies including improved housing design with ventilation, shade provision, cooling systems, and ample drinking water availability.

4. Renewable energy integration and sustainable farm management

Integration of renewable energy technologies advances both climate change mitigation and adaptation objectives. Solar photovoltaic systems powering water pumping, cooling equipment, and milk cooling reduce fossil fuel dependency and operational costs while enhancing farm resilience to energy supply disruptions. Biogas digesters utilizing dairy cattle manure produce methane for energy generation while managing nutrient waste. Life cycle assessments demonstrate that renewable energy integration combined with improved manure management reduces farm-level greenhouse gas emissions 20-35% while improving economic viability. Furthermore, diversification of on-farm income streams through integrated crop-livestock systems, agroforestry, and value-addition activities enhances economic resilience. Conservation agriculture practices including reduced tillage and improved crop residue management enhance soil water retention, build soil carbon, and increase productivity. In East African contexts, integration of dairy production with improved crop cultivation creates diversified income streams and improved household nutrition security.

5.INSTITUTIONAL, POLICY, AND SOCIOECONOMIC DIMENSIONS

Effective large-scale climate adaptation requires supportive institutional and policy environments transcending individual farm management. Extension services providing technical training in heat stress management, improved feeding, and disease surveillance prove essential for rapid technology dissemination. Farmer organizations aggregating smallholders enable collective investment in shared infrastructure and enhance negotiating power for input procurement and milk marketing. Access to credit facilitates investment in adaptation technologies including cooling systems, water harvesting infrastructure, and improved animal genetics. Research from diverse developing country contexts demonstrates that farmers with stronger market integration, extension contact, and credit access adopt climate-smart practices at substantially higher rates than isolated smallholders. Index-based livestock insurance provides critical risk management instruments enabling farmers to invest in adaptation without catastrophic financial consequences from climate-induced production shocks. In developing countries where insurance uptake remains limited, government premium subsidies prove essential for enabling farmer participation. Climate-informed seasonal forecasting integrated with production planning tools enhances farm-level decision-making, enabling farmers to adjust stocking rates, fodder conservation, and supplementary feeding in anticipation of predicted conditions. Policy frameworks promoting climate-smart agriculture, including investment in research and development infrastructure, prove foundational for widespread adaptation.

6.SYNTHESIS AND FUTURE DIRECTIONS

Contemporary scientific evidence synthesized in this review unambiguously demonstrates that climate change poses substantial and escalating challenges to global dairy production systems. Rising temperatures impair animal productivity directly through heat stress and indirectly through reduced feed availability and expanded disease incidence. Economic analyses indicate that without adaptive measures, climate change will reduce global dairy production capacity 2-4% by 2050, with developing country impacts potentially exceeding 10% in vulnerable regions. However, this review also documents that effective adaptation pathways exist, encompassing technological innovations, management improvements, and institutional reforms capable of substantially enhancing resilience while maintaining production sustainability. Successful adaptation strategies integrate genetic selection for thermotolerance, precision feeding systems responsive to thermal stress, comprehensive water management, renewable energy adoption, and disease surveillance and management. Critical future research priorities encompass development of region-specific adaptation protocols suited to particular agroecological and socioeconomic contexts; integration of climate-smart technologies at whole-farm systems level; assessment of cumulative adaptation benefits and potential trade-offs; and investigation of implementation mechanisms enabling scaled technology adoption. Additionally, as climate impacts progressively intensify, some regions may require transformational system changes including production location shifts or fundamental modifications to production orientation.

CONCLUSION

Global dairy production faces formidable challenges from anthropogenic climate change, manifested through thermal stress compromising productivity and animal welfare, water scarcity threatening feed security and operational viability, climate-driven disease emergence and range expansion, and economic pressures on farm profitability. These interconnected challenges prove especially acute for smallholder dairy farmers in tropical and subtropical developing regions, who typically lack infrastructure and capital enabling technological adaptation. However, comprehensive review of contemporary scientific evidence documents that well-designed, multi-faceted adaptation strategies substantially mitigate climate impacts and enhance system resilience. Successful approaches integrate genetic improvement through selective breeding and genomic technologies targeting thermotolerance, precision nutrition systems tailored to heat stress conditions, strategic water management through harvesting and efficient use, renewable energy integration reducing fossil fuel dependence, comprehensive infrastructure development including cooling systems and shade provision, improved disease surveillance and management, and supportive institutional environments providing extension services, credit access, insurance schemes, and climate information services. Implementation of these adaptive strategies at global scale requires coordinated effort spanning technological innovation, institutional development, policy support, and farmer capacity building. With sustained commitment from national and international actors, the dairy sector can navigate climate challenges while securing long-term production sustainability, ensuring global food security, and supporting farmer livelihoods in an increasingly climate-variable world.

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