Cattle Heat Stress and Climate Adaptation

Rising temperatures from climate change are increasing heat stress in cattle, causing significant welfare impacts and production losses requiring adaptation strategies.

Key Facts

Cattle begin showing signs of heat stress at temperatures above approximately 25 degrees Celsius depending on humidity
Heat stress causes reduced feed intake, milk production, fertility and immune function
Pregnant cows under heat stress have poorer birth outcomes and calves with impaired immune development
Shade, water and ventilation are the primary management tools for heat stress mitigation
Dark-coated breeds and high-producing dairy cows are most vulnerable to heat stress
Climate projections suggest heat stress events will increase significantly in frequency and intensity

Welfare Considerations

Heat stress in cattle is already a significant welfare and productivity problem in many countries, and climate change is making it worse. Physiological heat stress causes discomfort, reduced appetite, immune suppression and reproductive failure. In extreme events it causes death. Dairy cows producing high volumes of heat are particularly vulnerable. Adaptation measures - shade access, fans, sprinkler systems, timing of feeding and movement to cooler parts of the day - reduce suffering but require investment. Breed selection for heat tolerance is a longer-term strategy. Climate mitigation itself is the most fundamental intervention.

What You Can Do

Advocate for shade requirement regulations in outdoor cattle-keeping systems
Support research into heat-tolerant cattle breeds and genetics for future climate resilience
Urge livestock farmers to invest in shade and cooling infrastructure before heat events occur
Support climate policy as an indirect but fundamental animal welfare intervention
Choose beef and dairy from farms with demonstrable heat stress management plans