1. School of Agricultural and Veterinarian Sciences São Paulo State University (Unesp) Jaboticabal SP Brazil
2. Department of Animal Biosciences Centre for Genetic Improvement of Livestock University of Guelph Guelph Ontario Canada
3. National Council for Scientific and Technological Development (CNPq) Jaboticabal SP Brazil
4. College of Veterinary and Animal Science São Paulo State University (Unesp) Botucatu SP Brazil