Fuentes Hernández, V.O., Bernal Canseco, A., Fuentes Castro, M.L. y Orozco Hernández, J.R. 1. The effect of naloxone on reproductive behavior and plasma prolactin levels after weaning in third lactation sows. Revista Científica de la Facultad de Ciencias Veterinarias. 21, 4 (1).