Group Sow Housing Welfare: Science and Implementation Guide

Key Facts

• The EU banned gestation stalls for the majority of pregnancy since 2013 — a major welfare advance
• Group housing challenges include managing aggression, ensuring subordinate sows access adequate feed
• Electronic sow feeding (ESF) systems use transponders to allow individual feeding in a group environment
• Sows in group housing show more natural behavior, less stereotypy, and better cardiovascular fitness
• Transition from stalls to groups requires careful management of sow introduction and mixing protocols

Welfare Considerations

Group housing for gestating sows has substantially improved sow welfare in countries that have implemented bans, but the transition has revealed new welfare challenges. Aggression at mixing, competitive feeding, and injuries to subordinate sows can create welfare problems if management is poor. ESF systems solve the feeding competition problem but require investment and management expertise. Space allowance is critical: the minimum EU requirement (2.25m2 per sow) is insufficient for true welfare — 3-4m2 per sow is the evidence-based recommendation. Countries still using gestation stalls (USA, Canada, parts of Asia) represent major welfare reform opportunities.

What You Can Do

• Support pork products from group housing operations in countries that have implemented gestation stall bans
• Advocate for global adoption of gestation stall bans through international animal welfare standards
• If managing sows in groups, implement ESF or trickle-line feeding to prevent competitive feeding injuries
• Monitor sows daily for wounds from aggression — a welfare indicator that management needs improvement
• Provide environmental enrichment (rooting materials, manipulable objects) even in group housing systems