The design of pig housing has major welfare implications, and innovative pen designs are demonstrating that high productivity and high welfare are compatible when evidence-based design principles are applied.
Pig pen design welfare illustrates how structural decisions made at farm level have profound welfare consequences for individual animals. Barren concrete environments deny pigs the rooting, exploration, and nesting behaviours they are strongly motivated to perform, causing chronic frustration that expresses as aggression and tail biting. Providing rooting substrates - even simple interventions like hanging chains or straw - substantially reduces abnormal behaviour. Higher-welfare pen designs with appropriate space, complexity, natural light, and social management produce pigs with measurably better welfare profiles. The economic case for welfare-positive design is strengthened by reduced veterinary costs from aggression injuries and improved productivity in non-stressed animals.