Farm Animals

Pig Pen Design for Reducing Aggression at Regrouping

Regrouping unfamiliar pigs causes aggression and injury, but pen design, space allowance and management strategies can significantly reduce fighting.

Key Facts

Regrouping pigs triggers intense aggression lasting 24-72 hours as hierarchy is established
Injuries from fighting cause pain and increase infection risk
Providing additional space, feed and resting areas during regrouping reduces aggression intensity
Hay and straw provision at regrouping significantly reduces fighting and redirects behaviour
Dimming lights during the regrouping period reduces visual aggression triggers

Welfare Considerations

Regrouping is a major welfare challenge in pig production. Its frequency can be reduced and its impact mitigated through better design and management practices.

What You Can Do

Support pig welfare standards that minimise unnecessary regrouping
Ask producers about their regrouping protocols and injury monitoring
Advocate for space allowance requirements during mixing periods