1. Department of Animal Sciences; Federal Rural University of Semiarid Region (UFERSA); Mossoró RN 59625-900 Brazil
2. Department of Surgery; School of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo SP 05508−270 Brazil
3. Department of Morphology; Bioscience Center (BC), Federal University of Rio Grande Do Norte (UFRN); Natal RN 59078-970 Brazil
4. Department of Biological and Veterinary Sciences; Campus Curitibanos, University of Santa Catarina; Curitibanos SC 89529-000 Brazil
5. Department of Animal Reproduction; School of Veterinary Medicine and Animal Science; University of São Paulo; São Paulo São Paulo Brazil