The physical design of pig housing — flooring, space allowance, enrichment provision, and group size — profoundly influences pig welfare outcomes throughout the production cycle.
Pig pen design represents one of the most direct welfare interventions available in commercial pork production. Poor flooring causes chronic foot pain — a major and often invisible welfare problem. Inadequate space prevents species-typical locomotion and social behavior. Lack of rooting material causes behavioral frustration that manifests as tail biting and ear biting on pen-mates — welfare problems so common in barren intensive systems that tail docking became standard practice rather than addressing the underlying cause. Evidence-based pen design incorporating straw or deep litter substrate, appropriate space allowances, separate lying and dunging areas, and environmental complexity dramatically reduces these welfare harms. The welfare case for better pen design is clear; adoption lags primarily due to capital investment and slurry management infrastructure requirements.