Scientific evidence on gestation crate welfare is unambiguous. Understanding what research shows about sow behavior, physiology, and psychological state in crates versus group housing informs welfare advocacy.
The science on gestation crate welfare is remarkably consistent across decades of research: crate-housed sows show more stereotypic behavior, higher stress hormones, reduced bone density, impaired immune function, and more pessimistic cognitive states than group-housed equivalents. The welfare case for group housing is not close — it is overwhelming. The persistence of gestation crates in major producing countries reflects economic inertia, regulatory failure, and enforcement gaps rather than scientific uncertainty. Consumers, retailers, and food companies who demand gestation-crate-free pork are acting on the clearest possible scientific consensus about animal welfare.