Pig Enrichment Science: What Works and Why

Pigs are highly intelligent and curious animals. Understanding the science behind effective enrichment is key to improving welfare on farm.

Key Facts

Pigs have the cognitive capacity of a 3-year-old child and require mental stimulation to thrive.
Barren environments lead to boredom, frustration, and redirected behaviours like tail biting.
Rooting is a highly motivated behaviour — pigs may root for up to 7 hours per day in natural settings.
Manipulable materials (straw, compost, mushroom substrate) score highest in enrichment studies.
EU law requires enrichment for pigs, but compliance and quality vary widely across farms.
Novel objects lose value quickly — rotation and complexity are key to sustained engagement.

Welfare Considerations

Enrichment for pigs must go beyond bare legal minimums. Research consistently shows that substrate-based enrichment — materials pigs can root, chew, and investigate — is far more effective than hanging chains or fixed objects. Effective enrichment reduces stress hormones, lowers aggression, decreases tail biting, and improves weight gain. The Five Domains model emphasises behavioural opportunity as central to positive welfare, and pigs are a prime example: when given the chance to express natural behaviour, they show measurable improvements in both physical and psychological health.

What You Can Do

Buy pork from farms certified to higher welfare standards that mandate substrate enrichment.
Support campaigns by Compassion in World Farming for EU enrichment law enforcement.
Encourage retailers and food companies to require verified enrichment in their pork supply chains.
Share welfare science with farmers through extension networks and agricultural media.