1. Large Animal Veterinary Teaching Hospital, College of Agronomy and Veterinary Medicine, Universidade de Brasília, Brasília 70910-970, DF, Brazil
2. Independent Researcher, Brasília 70760-517, DF, Brazil
3. Animal Reproduction Department, Univerity Center of Brasília (CEUB), Brasília 70790-075, DF, Brazil
4. Veterinary Pathology Laboratory, College of Agronomy and Veterinary Medicine, Universidade de Brasília, Brasília 70910-970, DF, Brazil