Brazilian Journal of Veterinary Research and Animal Science; Vol. 46 Núm. 5 (2009); 400-403 Brazilian Journal of Veterinary Research and Animal Science; Vol. 46 No. 5 (2009); 400-403 Brazilian Journal of Veterinary Research and Animal Science; v. 46 n. 5 (2009); 400-403 Brazilian Journal of Veterinary Research and Animal Science; V. 46 N. 5 (2009); 400-403 Brazilian Journal of Veterinary Research and Animal Science Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo (FMVZ-USP) instacron:USP