Brazilian Journal of Veterinary Research and Animal Science; Vol. 46 Núm. 1 (2009); 69-76 Brazilian Journal of Veterinary Research and Animal Science; Vol. 46 No. 1 (2009); 69-76 Brazilian Journal of Veterinary Research and Animal Science; v. 46 n. 1 (2009); 69-76 Brazilian Journal of Veterinary Research and Animal Science; V. 46 N. 1 (2009); 69-76 Brazilian Journal of Veterinary Research and Animal Science Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo (FMVZ-USP) instacron:USP