Pig Enrichment Science: What Works and Why

What the scientific evidence tells us about which enrichment approaches genuinely improve pig welfare and how to implement them at commercial scale.

Key Facts

Scientific review shows that substrate materials like compost, peat, and chopped straw are far superior to hanging objects
Pigs interact with enrichment materials at much higher rates when they are novel, manipulable, and edible
Enrichment that reduces tail-biting pays for itself in reduced veterinary costs and improved growth rates
Enrichment effectiveness decreases rapidly over time without rotation and novelty
Regulatory enrichment requirements in most countries are insufficient based on current scientific evidence

Welfare Considerations

The science of pig enrichment is now sufficiently advanced to distinguish clearly between what works and what is merely compliance. Hanging chains, rubber toys, and plastic objects — the most commonly provided enrichment in commercial systems — have minimal lasting effects on pig welfare or behaviour. What pigs genuinely need is materials they can root through, manipulate, consume, and investigate: straw, compost, peat, wood chips, and similar organic substrates that engage their natural exploratory drives. The gap between the regulatory minimum and the scientific evidence is wide, and closing that gap would represent a significant improvement for hundreds of millions of pigs annually.

What You Can Do

Choose pork from farms using straw-based or deep-litter systems whenever possible
Advocate for enrichment standards in pig regulations to be updated to reflect current scientific evidence
Support organisations like Compassion in World Farming that actively lobby for better enrichment requirements
Ask food companies and retailers about the enrichment standards of the pig farms in their supply chains
Follow research from the Pig Veterinary Society and universities working on practical enrichment solutions