Pen design profoundly influences pig welfare by determining space availability, enrichment access, dunging behavior, and social dynamics that affect injury rates and positive welfare states.
The physical environment of the pig pen determines what behaviors are possible and impossible for its occupants. Pens that provide adequate space, appropriate enrichment, comfortable flooring, and stable social groups make it possible for pigs to live well. Pens that fail on these dimensions make suffering inevitable regardless of the skill of the stockperson. Welfare science has identified the key design parameters - implementing them is a matter of industry will and regulatory ambition.