1. Federal University of Western Pará - UFOPA; Santarém Brazil
2. Department of Surgery; Faculty of Veterinary Medicine and Animal Sciences; University of Sao Paulo; Sao Paulo Brazil
3. Department of Veterinary Medicine; Faculty of Animal Sciences and Food Engineering; University of Sao Paulo; Pirassununga Brazil
4. Department of Histology and Embryology; Sao Paulo State University; Dracena Brazil