Intensive pig farming, also known as pig factory farming, is the primary method of pig production, in which grower pigs are housed indoors in group-housing or straw-lined sheds, whilst pregnant sows are housed in gestation crates or pens and give birth in farrowing crates.The use of gestation crates for pregnant sows has lowered birth production costs; Gestation crates or individual stalls are used as a way to nurture the animals and protect them first during pregnancy. Because the animals are vulnerable during this time, with some sows more aggressive than others, the practice of separating the animals in crates keeps them from fighting and injuring each other. In addition, the case has also been made that crates make it easier for hog farmers to monitor individual sow health and administer vaccines as needed. Many of the world's largest producers of pigs (US, China, and Mexico) use gestation crates. The European Union has banned the use of gestation crates after the fourth week
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