Welfare of Pigs in Outdoor Versus Indoor Systems

Outdoor pig production generally provides better behavioral welfare than indoor systems but creates trade-offs around disease, predation, and environmental impact.

Key Facts

Outdoor pigs have access to rooting, wallowing, and natural foraging behaviors largely absent in indoor systems
Outdoor systems show lower rates of tail biting and ear necrosis than intensive indoor housing
However, outdoor pigs face greater exposure to internal parasites, predation, and temperature extremes
Stocking density in outdoor systems varies widely — poorly managed outdoor systems can be worse than good indoor ones
Wallowing is not optional enrichment for pigs — it is the primary thermoregulatory mechanism in the absence of sweat glands

Welfare Considerations

Outdoor systems provide behavioral opportunities that indoor systems fundamentally cannot, including rooting, wallowing, and social group stability. These meet core porcine behavioral needs. However, outdoor welfare quality is not automatic — management quality, stocking density, and provision of wallowing facilities all determine whether outdoor access translates to welfare benefits.

What You Can Do

Choose outdoor-raised pork certified under RSPCA Assured or equivalent standards with space and wallowing requirements
Support farms investing in mud wallows and shade structures for outdoor pig herds
Advocate for outdoor access as a minimum standard for higher-tier welfare certification in pig production