Livestock Heat Stress: Welfare in a Warming World

Heat stress in livestock causes significant suffering, production losses, and mortality, and climate change is intensifying these welfare challenges across temperate and tropical farming regions.

Key Facts

Dairy cows in heat stress produce less milk, have impaired reproduction, and show elevated stress hormones
Heat stress in poultry causes panting, reduced feed intake, and death when temperatures exceed thresholds
Pigs are particularly vulnerable to heat stress because they cannot sweat and have limited evaporative cooling
US livestock industry losses from heat stress exceed $1.7 billion annually
Shade, ventilation, and water access are the most effective heat stress mitigation tools

Welfare Considerations

Heat stress in livestock represents a growing welfare crisis as climate change pushes temperatures higher across traditional farming regions. Animals in intensive confinement systems have limited behavioral options to manage thermal load — they cannot seek shade, reduce activity, or disperse as wild animals would. The welfare consequence is sustained physiological stress, discomfort, and in severe cases death. Welfare-centered responses include mandatory shade and ventilation standards, monitoring of temperature-humidity indices, and reducing stocking densities to allow thermal management.

What You Can Do

Support mandatory shade and ventilation standards for livestock in welfare certification programs
Advocate for climate policies that reduce the intensification of heat stress events
Choose animal products from farms with documented heat stress management protocols
Support research into livestock breeds and management systems resilient to higher temperatures