Brazilian Journal of Veterinary Research and Animal Science; Vol. 45 Núm. 3 (2008); 200-205 Brazilian Journal of Veterinary Research and Animal Science; Vol. 45 No. 3 (2008); 200-205 Brazilian Journal of Veterinary Research and Animal Science; v. 45 n. 3 (2008); 200-205 Brazilian Journal of Veterinary Research and Animal Science; V. 45 N. 3 (2008); 200-205 Brazilian Journal of Veterinary Research and Animal Science Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo (FMVZ-USP) instacron:USP