Farmed Pig Enrichment Science: What Actually Works

Evidence-based review of enrichment interventions for pigs that demonstrably improve welfare outcomes in commercial settings.

Key Facts

Substrate enrichment including straw, compost, and soil dramatically reduces aggression and tail biting in pigs
Pigs have a strong rooting drive — materials that allow rooting are more effective than hanging objects
Manipulable materials must be genuinely investigable — fixed chains or rubber balls do not meet this standard
Enrichment reduces tail biting, which is a welfare crisis in intensive pig farming causing severe injuries
The EU requires enrichment for pigs but does not specify rooting-appropriate materials, creating a compliance gap

Welfare Considerations

Pig enrichment science has advanced to the point where we know with confidence what works and what does not. Rooting substrate — materials pigs can manipulate with their snouts in the ground plane — is dramatically more effective at reducing abnormal behaviors than suspended or fixed objects. The reason is biological: pigs are ground foragers with a powerful innate drive to root and manipulate substrate. Providing hanging chains satisfies EU compliance requirements without satisfying pig needs. Regulatory reform to require rooting-appropriate materials, combined with commercial incentives for higher-welfare systems, represents the clearest path to meaningful improvement at scale.

What You Can Do

Support pork from farms with documented straw or substrate provision for enrichment
Advocate for EU and national enrichment regulations to specify rooting-appropriate materials rather than just "enrichment"
Encourage food companies sourcing pork to require enrichment auditing that verifies material type, not just presence
Learn about pig enrichment science and share the evidence that rooting substrate reduces tail biting