Brazilian Journal of Veterinary Research and Animal Science, Vol 31, Iss 3-4 (1994) Brazilian Journal of Veterinary Research and Animal Science; Vol. 31 Núm. 3-4 (1994); 198-204 Brazilian Journal of Veterinary Research and Animal Science; Vol. 31 No. 3-4 (1994); 198-204 Brazilian Journal of Veterinary Research and Animal Science; v. 31 n. 3-4 (1994); 198-204 Brazilian Journal of Veterinary Research and Animal Science; V. 31 N. 3-4 (1994); 198-204 Brazilian Journal of Veterinary Research and Animal Science Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo (FMVZ-USP) instacron:USP