PREVALENCE OF THE INFECTION BY THE BOVINE LEUKOSIS VIRUS IN FLECKVIEH CATTLE RAISED AT SO PAULO STATE, BRAZIL.

E. H. BIRGEL JUNIOR, W. M. C. DIAS, R. M. SOUZA, F. C. POGLIANI, D. B. BIRGEL, E. H. BIRGEL

Abstract


The prevalence of infections by bovine leukosis virus in bovines of the Fleckvieh breed raised at São Paulo State, Brazil, was investigated with the glycoprotein antigen (gp 51)in agar-gel immunodiffusion tests. The overall prevalence of bovine leukosis virus antibodies was 9.24 % (44/476); foci of the infection by the bovine leukosis virus existed in 85.71 %
(6/7) of the studied herds. The samples arranged according to various age groups showed a higher prevalence in older animals. The values obtained were the following: up to 3 months ? 0.00% (0/55); 3-6 months ? 0.00% (0/41); 6-12 months ? 1.07% (1/93); 12-24 months ? 4.49% (4/89); 24-48 months ? 9.78% (9/92); 48-72 months ? 13.52% (12/51) and older than 72 months ? 32.72% (18/55).
KEY-WORDS: Bovine leukosis virus. Prevalence. Fleckvieh cattle.



DOI: http://dx.doi.org/10.15361/2175-0106.2006v22n2p122-129