Environmental enrichment for farmed pigs is now legally required in several jurisdictions, and the evidence base for its welfare benefits continues to strengthen across multiple indicators.
The evidence base for pig enrichment is now sufficiently strong that legal requirements have been implemented across the EU, though compliance and enforcement vary significantly between member states. Enrichment works because it channels motivated oral and investigatory behaviors toward appropriate substrates rather than toward pen mates. Pigs that root, chew, and manipulate enrichment materials are less frustrated and less likely to redirect behavior into tail-biting. The quality of enrichment matters — fixed chains are manipulated briefly and then ignored, while rooting substrates like straw maintain sustained engagement. The welfare benefit is proportional to the quality and quantity of enrichment provided. Systems that provide deep straw bedding address multiple welfare needs simultaneously: thermal comfort, enrichment, and substrate for natural rooting behavior.