Farmed Animals

Pig Social Behavior and Group Housing Welfare

Pigs are highly social animals with complex relationships; group housing management determines whether social needs are met or frustrated.

Key Facts

Pigs establish stable dominance hierarchies through agonistic interactions
Mixing unfamiliar pigs causes intense fighting until new hierarchies form
Stable groups with familiar individuals show lower aggression and better welfare
Space allowances and resource distribution reduce competition and injury risk

Welfare Considerations

Pig social welfare depends critically on group stability and resource availability. Mixing unfamiliar pigs causes intense fights with injury to submissive animals. Stable groups with established relationships show much lower aggression. Adequate space, feeder access, and enrichment reduce competition-driven welfare harms. All-in all-out housing management that maintains stable groups dramatically improves social welfare.

What You Can Do

Support pork certification requiring stable social groups and adequate resources
Advocate for mixing management standards in pig welfare legislation
Choose pork from farms demonstrating low tail biting and injury rates
Engage producers about all-in all-out management as a welfare improvement