Pig Heat Abatement in Summer: Welfare and Production

Pigs are highly susceptible to heat stress because they cannot sweat effectively. During hot summers, inadequate heat abatement causes significant suffering and welfare harm on farms.

Key Facts

Pigs have very few functional sweat glands and rely on respiration and wallowing to regulate body temperature
Heat stress begins at ambient temperatures above 25-28 degrees Celsius for growing pigs, lower for sows
Signs of heat stress include panting, reduced feed intake, prostration, and in severe cases, death
Heat stress costs the US pig industry over $900 million annually in production losses
Effective heat abatement includes sprinkler systems, evaporative cooling, increased airflow, and lower stocking density
Pregnant sows are especially vulnerable - heat stress causes embryo death, reduced litter size, and impaired milk production

Welfare Considerations

Heat stress in pigs causes acute suffering including severe respiratory distress, muscle weakness, and in extreme cases heat stroke and death. Chronic mild heat stress causes suppressed immune function, hormonal disruption, and chronic discomfort throughout summer months. Welfare standards require adequate cooling infrastructure, but implementation varies widely especially in outdoor systems during heat waves. Climate change is extending the duration and intensity of heat stress periods globally, making proactive heat abatement planning increasingly critical for pig welfare.

What You Can Do

Ensure any pig housing you oversee has adequate ventilation, cooling systems, and shade
Monitor environmental temperatures and activate cooling measures proactively before heat stress occurs
Provide cool, clean water at all times - intake increases dramatically during hot weather
Adjust feeding schedules to cooler parts of the day to encourage adequate feed intake
Reduce stocking density during heat waves to decrease heat generation from animal bodies
Advocate for climate-resilient pig farming standards that mandate heat abatement in animal welfare codes