Gestation crates confine pregnant sows individually for most of their 16-week pregnancies, severely restricting natural behavior and causing chronic stress.
Sows in gestation crates cannot perform motivated behaviors including turning, nesting preparation, and social interaction. The frustration of movement motivation causes chronic stress and stereotypic behaviors including bar-biting and head-swaying. The technical and economic solutions to group housing exist and have been demonstrated at scale in countries that have implemented the ban.