FIELD: cattle-breading; veterinary medicine. SUBSTANCE: method involves administering leukocytic interferon in a prescribed dose to cows daily during the period from twelfth to sixteenth day after being inseminated. Interferon contributes to yellow body function being supported in crucial period of pregnancy (12-16 days) and in this way increasing embryo survival capability and preserving cow pregnancy by 18-23% EFFECT: enhanced effectiveness in increasing cow pregnancy stability and embryo survival capability. 2 tbl
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