Enrichment Materials for Pigs: Evidence Review

Research has identified which enrichment materials most effectively meet pigs' behavioral needs and reduce the risk of tail biting and aggression.

Key Facts

Manipulable materials that can be chewed, rooted, and investigated are most effective for pigs
Straw provides the richest enrichment as it satisfies multiple behavioral needs simultaneously
Hanging chains and wooden boards are better than nothing but less effective than organic materials
EU law requires manipulable materials for pigs but compliance with the spirit of the law varies widely

Welfare Considerations

The evidence on pig enrichment is clear: organic, destructible materials that engage rooting and foraging behavior are substantially more effective at satisfying behavioral motivation than hard, non-destructible objects like chains. Pigs investigate enrichment most intensively when it is novel, and materials that can be modified through use — like straw or compost — maintain engagement longer than fixed objects. The provision of straw as bedding rather than slatted floors addresses multiple welfare needs simultaneously: thermal comfort, rooting opportunity, and investigation. Where straw bedding is not possible for management reasons, a combination of suspended manipulable materials with edible elements represents the next best approach.

What You Can Do

Support pig welfare standards that specify high-quality organic enrichment materials rather than permitting chains alone
Choose pork from farms that provide straw bedding or equivalent organic enrichment
Advocate for enforcement of enrichment requirements that focus on outcomes rather than mere provision of any material
Engage with the pig industry on transitioning to more effective enrichment systems