Heat stress in cattle causes significant welfare harm and production losses during increasingly frequent extreme weather events, with effective mitigation strategies available but inconsistently implemented globally.
Cattle heat stress represents a welfare problem with clear physical signs — cattle in heat stress pant, crowd around water sources, reduce activity, and in severe cases show signs of physiological crisis. The chronic effects are less visible but significant: reduced nutrient intake, immune suppression, and reduced reproductive performance all indicate sustained physiological compromise. The prenatal programming effect — where calves born to heat-stressed dams have lifelong health deficits — extends the welfare impact across generations. Climate change projections indicate this welfare problem will intensify across traditional cattle-keeping regions. The mitigation technologies are available and cost-effective relative to production losses: shade structures, evaporative cooling systems, and adequate water access substantially reduce heat stress welfare harm.