Brazilian Journal of Veterinary Research and Animal Science; Vol. 33 (1996): Suplemento; 305-312 Brazilian Journal of Veterinary Research and Animal Science; v. 33 (1996): Suplemento; 305-312 Brazilian Journal of Veterinary Research and Animal Science; V. 33 (1996): Suplemento; 305-312 Brazilian Journal of Veterinary Research and Animal Science Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo (FMVZ-USP) instacron:USP