Decades of peer-reviewed research provides clear scientific evidence that gestation crates cause significant, chronic welfare harm to sows through physical and psychological mechanisms.
The scientific evidence against gestation crates is among the strongest for any farm animal housing system. Multiple independent research programs across several decades demonstrate welfare harms at physical, physiological, and behavioral levels. Sows in gestation crates lose muscle, lose bone density, develop stereotypies reflecting frustrated motivation, and show elevated stress responses when released into group systems. This evidence was central to EU and state-level legislative changes and has underpinned voluntary corporate commitments to crate-free production. The science is not contested — the question is one of implementation speed and political will.