Growth performance, carcass composition and leg weakness in pigs exposed to different levels of physical activity

alojamiento de animales animal housing carcass composition cerdo composition de la carcasse crecimiento croissance debilidad de las patas faiblesse des pattes feed conversion efficiency feed intake growth housing leg weakness logement logement des animaux loose housing physical activity piggeries pocilga porcherie porcin prise alimentaire (animaux) swine vivienda