Animal Liberation - Mother pigs are confined to the farrowing crates for 5-weeks. Naturally, she would build a comfortable nest for her young. Here she is forced to live on hard concrete
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Free farrowing systems on commercial farms in Denmark and Spain - Articles - pig333, pig to pork community
Welfare and Productivity of Sows and Litters in Farrowing Crate Compared to Lactation Pen 1C-113 (1C-104)
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