Farm Animals

Farmed Pig Social Hierarchy Stability

Stable social hierarchies in pig groups reduce chronic aggression and improve welfare for all individuals once established.

Key Facts

Pigs establish dominance hierarchies through initial fighting
Stable hierarchies reduce ongoing aggression and allow predictable access to resources
Hierarchy disruption through regrouping requires re-establishment at welfare cost
Electronic sow feeding stations allow subordinate sows to eat without direct competition
Stable group composition from weaning to slaughter reduces lifetime aggression exposure

Welfare Considerations

Pigs in stable social groups with established hierarchies experience less ongoing aggression than pigs in frequently disrupted groups. Minimising group composition changes throughout production and providing resources that reduce competition allow hierarchies to stabilise and provide ongoing welfare benefit for lower-ranking animals.

What You Can Do

Support all-in all-out production systems maintaining stable social groups
Advocate for stable group housing as a welfare standard for pigs
Choose pork from farms with documented stable social group management