Livestock Heat Stress: Welfare Impacts of Rising Temperatures

As global temperatures rise, heat stress in farmed animals is becoming one of the most widespread welfare problems in animal agriculture.

Key Facts

Cattle, pigs, and poultry all have limited ability to regulate body temperature through sweating or panting under extreme heat
Heat stress causes reduced feed intake, weight loss, lower milk production, impaired reproduction, and increased disease susceptibility
Broiler chickens bred for fast growth are particularly vulnerable because their metabolic rate generates excess body heat
Economic losses from heat stress in livestock are estimated at billions of dollars annually in the United States alone
Climate projections suggest heat stress events will become more frequent, more intense, and longer-lasting across major livestock regions

Welfare Considerations

Heat stress causes real and measurable suffering in farmed animals. Animals pant desperately, crowd around water sources, reduce movement, and in severe cases collapse and die. Confined animals in barns without adequate ventilation or cooling face the worst conditions. Modern high-production breeds are often physiologically more vulnerable than heritage breeds because metabolic demands of rapid growth or high milk production generate additional body heat.

What You Can Do

Support welfare standards that require cooling systems in livestock facilities in heat-prone regions
Advocate for breed diversity policies that allow less heat-sensitive genetics to be maintained
Reduce meat and dairy consumption to lower demand pressure driving intensive confinement systems
Urge agricultural authorities to include heat stress metrics in welfare assessment frameworks
Support research into heat-tolerant breeds and lower-intensity production systems