Farmed Pig Summer Heat Stress: Management Strategies

Heat stress in farmed pigs during summer months significantly reduces welfare, productivity, and reproductive success, requiring proactive management of housing, ventilation, and water access.

Key Facts

Pigs begin experiencing heat stress at temperatures above 25 degrees Celsius.
Unlike many species, pigs cannot sweat effectively and rely on respiratory panting to regulate body temperature.
Heat stress reduces feed intake, growth rate, and reproductive performance in breeding sows.
Gestating sows exposed to summer heat often produce smaller litters with lower birth weights.
Wallowing behaviour in pigs serves a thermoregulatory function — intensive housed pigs are denied this outlet.
Mortality from heat stress can occur rapidly in poorly ventilated confinement buildings during heatwaves.
Studies show that summer heat stress costs the US pig industry over 300 million dollars annually in losses.

Welfare Considerations

Heat stress in farmed pigs is both a welfare crisis and a production problem. Pigs in commercial confinement systems are particularly vulnerable because they lack access to wallowing and shade. Effective mitigation requires mechanical ventilation, evaporative cooling systems, reduced stocking density during hot periods, and continuous access to cool, fresh water. Farms operating in increasingly hot climates must treat summer heat management as a core welfare obligation rather than an optional upgrade.

What You Can Do

Choose pork products from farms with independently verified welfare standards that include heat stress provisions.
Support higher welfare certification schemes that require adequate ventilation and cooling in pig housing.
Advocate for climate adaptation requirements in livestock welfare regulations.
Reduce pork consumption or shift to plant-based alternatives to reduce overall demand for intensively farmed pork.