Farm Animals

Pig Aggression Management in Group Housing

Aggression between pigs in group housing systems causes significant welfare harms through injuries, stress, and reduced access to resources for subordinate animals.

Key Facts

Pigs establish dominance hierarchies through fighting when groups are mixed
Mixing unfamiliar pigs causes aggression that peaks in the first 24-72 hours
Tail biting is a redirected behavior linked to overcrowding and boredom
Injuries from pig fights can be severe and lead to infections
Enrichment materials reduce aggression by 50-80% in some studies
Housing design including refuge areas significantly reduces injury rates

Welfare Considerations

Aggression in pig groups causes physical injuries including lacerations, ear damage, and lameness, as well as chronic psychological stress for subordinate animals denied access to food and resting areas. The widespread practice of tail docking to reduce cannibalism treats a symptom while leaving the underlying welfare problem of inadequate environments unaddressed. Housing design and management changes can substantially reduce aggression without mutilations.

What You Can Do

Support pork producers committed to providing enrichment and adequate space
Advocate against tail docking as a substitute for addressing root causes of aggression
Choose pork from farms with verified enrichment and space standards
Support research into pig social behavior and aggression prevention
Contact food companies to ask about their pig welfare commitments