1. Department of Animal Science, Universidade Federal Rural do Semiárido, Mossoró, RN, Brazil
2. Laboratory of Physiology and Control of Reproduction, Veterinary School, State University of Ceará, Fortaleza, Ceará, Brazil
3. Academic Unit of Agricultural Science, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
4. Department of Science Universidad de La Laguna, Santa Cruz de Tenerife, Canary Islands, Spain