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Johnson, A.K., Marchant-Forde, J.N. (2009). Welfare of Pigs in the Farrowing Environment. In: Marchant-Forde, J.N. (eds) The Welfare of Pigs. Animal Welfare, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8909-1_5
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