Birgitte I. Damm, Vivi Moustsen, Erik Jørgensen, Lene J. Pedersen, Teresia Heiskanen, and Bjorn Forkman. Sow preferences for walls to lean against when lying down. Applied Animal Behaviour Science, 99(1-2):53–63, August 2006.
Jens Malmkvist, Lene Juul Pedersen, Birthe Marie Damgaard, Karen Thodberg, Erik Jørgensen, and Rodrigo Labouriau. Does floor heating around parturition affect the vitality of piglets born to loose housed sows?. Applied Animal Behaviour Science, 99(1-2):88–105, August 2006.
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