Pig Outdoor Wallowing and Thermoregulation

Pigs lack functional sweat glands and depend on wallowing and shade to regulate body temperature, making thermal management a critical welfare issue in warmer climates.

Key Facts

Pigs cannot sweat effectively and rely on panting and wallowing for heat dissipation
Core body temperature above 40 degrees Celsius is life-threatening for pigs
Outdoor pigs without mud wallows or shade suffer serious heat stress in warm weather
Heat stress reduces feed intake, growth rate, and reproductive performance
Simple shade structures and wallowing areas dramatically reduce heat stress welfare harm

Welfare Considerations

Pig thermal welfare is a serious welfare issue in warm climates and during summer periods in temperate regions. Unable to sweat, pigs in direct sun without wallowing or shade quickly become hyperthermic. Heat stress causes discomfort, reduced activity, and in severe cases death. Outdoor systems that provide both shade and water for wallowing meet this need effectively. Indoor systems require mechanical ventilation and cooling. The welfare case for thermal management in pig production is clear and the solutions accessible.

What You Can Do

Ensure outdoor pigs have access to shade and mud wallows in warm weather
Advocate for thermal environment standards in pig welfare certifications
Support cooling system requirements for indoor pig facilities in warm regions
Choose pork from producers that demonstrate attention to thermal welfare management