Brazilian Journal of Veterinary Research and Animal Science; Vol. 32 Núm. 4 (1995); 224-228 Brazilian Journal of Veterinary Research and Animal Science; Vol. 32 No. 4 (1995); 224-228 Brazilian Journal of Veterinary Research and Animal Science; v. 32 n. 4 (1995); 224-228 Brazilian Journal of Veterinary Research and Animal Science; V. 32 N. 4 (1995); 224-228 Brazilian Journal of Veterinary Research and Animal Science Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo (FMVZ-USP) instacron:USP