1. Program in Physiological Sciences, Institute of Biological Sciences, Federal University of Rio Grande, Rio Grande, Brazil
2. Faculty of Veterinary Medicine, RAC-Center for Teaching and Research in Animal Reproduction, Federal University of Pelotas, Pelotas, Brazil
3. Institute of Biological Sciences, Federal University of Rio Grande, Rio Grande, Brazil
4. Faculty of Veterinary Medicine, Federal University of Pelotas, University Campus, Pelotas, Brazil