Livestock Heat Stress and Welfare

Climate change is intensifying heat stress in livestock globally, causing significant welfare impacts and reducing productivity in farming systems worldwide.

Key Facts

Heat stress occurs when body heat production exceeds the ability to dissipate it
Dairy cows experience heat stress above 22C — reducing milk production by 10-35%
Pregnant animals are especially vulnerable — heat stress during pregnancy affects fetal development
Dark-colored, heavy breeds are more susceptible to heat stress than lighter-colored cattle
Cooling interventions (shade, fans, misters) significantly reduce heat stress physiological markers
The economic losses from livestock heat stress in the US exceed $2.4 billion annually

Welfare Considerations

Heat stress in livestock causes both acute suffering and chronic health impacts. Cattle in heat stress show behavioral distress including bunching, reduced feed intake, and prolonged standing to avoid hot ground. Physiological changes including elevated cortisol, impaired immune function, and compromised reproductive performance accompany behavioral signs. As climate change increases both the intensity and duration of heat events, existing housing and management systems designed for historical climate conditions will become increasingly inadequate for animal welfare. Proactive adaptation including shade provision, cooling systems, and modified feeding schedules to avoid peak heat are evidence-based welfare interventions.

What You Can Do

Support livestock welfare standards that require cooling infrastructure as climate adaptation
Choose animal products from farms that have implemented heat stress mitigation systems
Advocate for climate policies that limit temperature increases threatening livestock welfare
Support research into heat-tolerant livestock breeds that can maintain welfare in warmer climates