A gestation crate, also known as a sow stall, is a metal enclosure in which a farmed sow used for breeding may be kept during pregnancy. A standard crate measures 2 m x 0.6 m, 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. A few days before giving birth, sows are moved to farrowing crates where they are able to lie down, with...