Broiler Chicken Thermal Comfort and Welfare

Broiler chickens are vulnerable to heat stress due to their rapid growth rate, high metabolic heat production, and limited capacity for thermoregulation. Managing thermal environment is critical for both welfare and productivity in intensive broiler production.

Key Facts

Broilers cannot sweat and rely primarily on panting to dissipate heat - an inefficient and stressful mechanism
Modern fast-growing broiler breeds have higher metabolic rates and are more susceptible to heat stress than slower-growing birds
Heat stress causes reduced feed intake, poor growth, increased mortality, and compromised immune function
Stocking density increases temperature within poultry houses, amplifying heat stress risk
Ventilation systems, evaporative cooling, and building insulation are key technical interventions
Wet-bulb temperature is a more accurate heat stress predictor than air temperature alone
Heat stress is increasingly significant as climate change raises ambient temperatures in key broiler producing regions
Water availability and cool drinking water are critical management factors during hot weather

Welfare Considerations

Heat stress causes acute suffering including open-mouth breathing, reduced activity, and in severe cases prostration and death. The combination of fast growth, high stocking density, and increasingly extreme weather creates compounding risk in modern broiler production. Climate adaptation in poultry housing is urgent and requires both technical investment and consideration of stocking density reductions during hot periods.

What You Can Do

Choose chicken from farms with demonstrated high welfare standards including appropriate stocking density
Support climate adaptation policies for agricultural buildings including cooling infrastructure
Advocate for stocking density reductions during heat events as a standard welfare requirement
Consider the climate vulnerability of intensive poultry production when making food choices