How pig pen design features including space allocation, enrichment provision, and social group management affect welfare outcomes in commercial production.
Pen design is a welfare determinant that is set at the point of building and changes only with significant capital investment — getting design right at the outset has multi-decade welfare consequences. Pen features that support good welfare include sufficient space to allow all pigs to express priority behaviors simultaneously, solid lying areas that can support enrichment provision, feeder spaces that prevent competitive exclusion, and thermal gradients that allow behavioral thermoregulation. Research comparing pen designs within the same space allowance demonstrates that shape, enrichment provision, and resource distribution matter independently of total area. Welfare-informed pen design represents a one-time investment that pays welfare dividends across the entire productive life of a building.