Outdoor Pig Summer Welfare: Heat Stress and Shade

Outdoor pigs in summer face significant heat stress risk as they lack sweat glands. Shade, wallowing, and management changes protect outdoor pig welfare in warm weather.

Key Facts

Pigs lack functional sweat glands and rely on wallowing and shade for thermoregulation
Heat stress above 25 degrees Celsius reduces feed intake and increases disease susceptibility in pigs
Outdoor sows in summer can experience significant heat stress without adequate shade provision
Wallowing in mud provides evaporative cooling and sunburn protection for unpigmented pigs
Light-colored pigs including some Landrace crosses are particularly susceptible to sunburn

Welfare Considerations

Outdoor pig production requires active welfare management in warm weather that intensive indoor systems handle automatically through ventilation. Pigs without access to shade or wallowing facilities on hot days experience genuine heat stress that suppresses immune function, reduces reproductive performance in sows, and causes real thermal discomfort. The welfare response is straightforward: adequate shade structures positioned across paddocks, wallow facilities or sprinkler systems, and monitoring of pigs for panting and clustering in shade as indicators of heat stress. The natural environment creates challenges that responsible outdoor production addresses proactively.

What You Can Do

Ensure adequate shade cover for all outdoor pigs during warm weather - one shade structure per group
Provide wallow facilities or sprinkler systems to enable evaporative cooling
Monitor outdoor pigs for signs of heat stress including panting, huddling in shade, and reduced movement
Increase water provision capacity in hot weather to meet elevated demand
Apply non-toxic sunscreen to the ears and back of pale-skinned outdoor pigs during extreme heat