1. Department of Veterinary Surgery and Animal Reproduction, Faculty of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, Brazil.
2. Department of Physiological Sciences, Institute of Biological Sciences, University of Brasília, Brasília, Brazil.
3. Department of Animal Reproduction, Faculty of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil.
4. Department of Biostatistics, Biosciences Institute, São Paulo State University (UNESP), Botucatu, Brazil.