Scientific research on pig enrichment has identified which objects and substrates genuinely improve welfare, moving beyond token provision to evidence-based enrichment programs.
Enrichment research for pigs has clearly established that not all enrichment is equal. Chains, rubber rings, and similar hard objects provide minimal behavioral benefit because they satisfy neither the cognitive nor physical requirements of rooting behavior. Straw, compost, and soil-like substrates that can be moved, sniffed, and rooted provide genuine engagement. The welfare significance of effective enrichment is substantial - pigs in well-enriched environments show lower stress hormones, less aggression, and reduced incidence of tail biting that leads to injury and infection.