Plasma urea levels on reproductive parameters of wool-less rams (Ovis aries, Linnaeus, 1758) - Cortada, Carmen Neusa Martins; Lucci, Carlos de Sousa; Forero Gonzalez, Rodrigo Alonso; Valentin, Renato; Mattos, Carla Balzano de (Brazilian Journal of Veterinary Research and Animal Science, 2000)