IVANOVA-PENEVA, Sonya. EFFECT OF PEN DESIGN ON BEHAVIOUR AND WELFARE OF LACTATING SOWS. Bulgarian Journal of Animal Husbandry, [S. l.], v. 49, n. 3, p. 23–29, 2012. Disponível em: https://agriacad.eu/ojs/index.php/bjah/article/view/635.. Acesso em: 8 nov. 2026.