Farmed Pig Sow Housing: Group Housing Transition and Welfare Outcomes

The transition from individual gestation stalls to group housing for pregnant sows represents one of the most significant ongoing welfare reforms in pig farming.

Key Facts

Gestation stalls confine individual pregnant sows in spaces too small to turn for 16 weeks
The EU banned gestation stalls except during the first 4 weeks of pregnancy in 2013
California Proposition 12 requires sow welfare standards for pork sold in the state
Group housing allows movement, social interaction, and expression of natural behaviors
Transition requires careful management to minimize aggression at mixing and ensure feed access
Properly managed group housing achieves comparable reproductive performance to stall systems

Welfare Considerations

The gestation stall ban represents one of the most significant welfare reforms in modern agriculture. Individual stalls denied pregnant sows the ability to turn around for the majority of a 16-week gestation — a profound restriction on a highly intelligent, social, and physically active animal. Group housing with appropriate space, feeding management to prevent competition, and stable social groups dramatically improves sow behavioral welfare. The economic and management challenges of transition are real but surmountable, as demonstrated by the thousands of European farms that have successfully made the change.

What You Can Do

Choose pork products certified to standards prohibiting gestation stalls
Support Proposition 12 and similar state-level requirements for sow welfare standards
Advocate for federal requirements eliminating gestation stalls in US pork production
Learn about sow welfare as an important dimension of the welfare costs of conventional pork production