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[The occurrence of antibodies to the glycoprotein antigen (gp70) of the enzootic leukemia virus in a leukemic herd].

The serological examination of 175 head of cattle in a herd suffering from leucosis included the study of the occurrence of antibodies to the glycoprotein antigen (gp70) of the virus of enzootic leucosis (BLV). At the same time, these antibodies were studied, as occurring in the F1 generation of the progeneis of 51 positive and 38 negative cows. The results demonstrate two important facts: increasing age brings about a higher percentage of animals having precipitating antibodies in the leucosis-affected herd; the other important finding is that the positive reaction of a cow has no significant influence on the occurrence of the antibodies in the progeny. It was found that under the actual conditions of the mentioned herd, the horizontal transmission of enzootic leucosis was predominant and that precipitating antibodies were detected by the immunodiffusion method in animals at the age from 9 to 12 months. It is desirable from the viewpoint of diagnostics and eradication of enzootic bovine leucosis to apply with utmost consistency the serological methods of examination and individual diagnostics. There is no reason for destroying whole families of animals in which the disease occurred, because no genetically conditioned occurrence of enzootic leucosis was demonstrated in the progenies of cows suffering from the disease. These facts should be respected in amending the instructions for controlling enzootic bovine leucosis.