Gestation crates are individual stalls with metal bars and concrete floors that confine pregnant pigs in the commercial pork production industry. Gestation crates measure 0.6-0.7 m (2.0-2.3 ft) by 2.0-2.1 m (6.6-6.9 ft), only slightly larger than the animals themselves, and restrict movement so severely that the sows are unable to turn around.1 In typical pig production facilities, gestation crates are placed side by side in long rows. They are primarily used on large-scale industrialized pig production operations, where thousands of pigs are produced annually in warehouse-like buildings.
The Humane Society of the United States, "The Economics of Adopting Alternatives to Gestation Crate Confinement of Sows" (2011). IMPACTS ON FARM ANIMALS. 29.