Research into enrichment provision for group-housed pigs has advanced substantially, revealing specific environmental features that dramatically reduce aggression, tail biting, and chronic stress in commercial herds.
Group housing without adequate enrichment creates conditions of chronic frustration and stress for pigs — highly intelligent, social animals with complex behavioural needs. The scientific evidence is now clear: rooting material (particularly straw or hay) is the single most effective enrichment, reducing tail biting rates by over 50% in trials. Yet many commercial systems provide only point-source objects like chains, which fail to meet pigs' motivational needs. Tail biting, when it occurs, creates a cascade of welfare harms — from the immediate pain of biting and infection to the stress of social conflict. Routine tail docking, used as a preventive measure, masks the welfare problem rather than addressing it, and is itself a painful procedure.