A gestation crate, also known as a sow stall, is a metal enclosure in which a farmedsow used for breeding may be kept during pregnancy.[1][2][3] A standard crate measures 6.6 ft x 2.0 ft (2 m x 60 cm).[4][5]
Sow stalls contain no bedding material and are instead floored with slatted plastic, concrete or metal to allow waste to be efficiently collected below. This waste is then flushed into open-air pits known as lagoons.[6][7] A few days before giving birth, sows are moved to farrowing crates where they are able to lie down, with an attached crate from which their piglets can nurse.
There were 5.36 million breeding sows in the United States as of 2016, out of a total of 50.1 million pigs.[8] Most pregnant sows in the US are kept in gestation crates.[1] The crates are banned for new installations only in Austria and Canada, so many sows are still confined there in pig breeding facilities. They are banned in the United Kingdom, Canada, Switzerland and Sweden, and in nine states in the US (Arizona, California, Colorado, Florida, Maine, Michigan, Ohio, Oregon and Rhode Island).[9][10] However, farrowing crates, in which female breeding pigs can be kept for up to five weeks, are not banned in the UK.[11]
Opponents of the crates argue that they constitute animal abuse, while proponents say they are needed to prevent sows from fighting among themselves.[12]
^ abWilson G. Pond, Fuller W. Bazer, Bernard E. Rollin (eds.), Animal Welfare in Animal Agriculture, CRC Press, 2011, p. 151ff.
^Bernard E. Rollin (1995), Farm Animal Welfare: Social, Bioethical, and Research Issues, Iowa State University Press, p. 76
^Reun, Pauk D.; et al. (1992). "Breeding and gestation facilities for swine: matching biology to facility design". Veterinary Clinics of North America: Food Animal Practice. 8 (3): 475–502. doi:10.1016/s0749-0720(15)30699-x. PMID1446265.
^Jeremy N. Marchant Forde (Fall 2010), "Housing and Welfare of Sows during Gestation"(PDF), Livestock Behavior Research Unit, USDA, The major issues surrounding the housing of sows during gestation are focused on the detrimental effects of close confinement and barren environment afforded by stalls on the one hand versus the detrimental effects of aggressive social behavior afforded by group housing on the other