FIELD: veterinary science. SUBSTANCE: method involves providing isolated keeping of group of replacement heifers free from cattle leukosis according to results of first serological research at one end (side) of keeping house together with cattle leukosis virus infected animals; providing serological leukosis virus control of replacement heifers free from cattle leukosis virus at 1-3 month interval. Method allows herds of 1-2 farms to be sanitated from leukosis and cattle leukosis virus infectivity of cows to be reduced to 5-8%. EFFECT: increased efficiency and simplified method. 1 tbl
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