Gestation crates confine pregnant sows in spaces so small they cannot turn around, causing severe physical and psychological suffering.
Pigs in gestation crates develop severe muscle atrophy, joint problems, pressure sores, and urinary tract infections. More profound is the psychological suffering: pigs are highly intelligent animals who engage in constant stereotypic bar-biting and rooting movements when deprived of movement and enrichment. Evidence of learned helplessness and depression-like states has been documented. This is considered one of the most severe welfare problems in modern agriculture.