FIELD: veterinary science, agriculture. SUBSTANCE: invention proposes the preliminary micronized 3,17-dihydroxy-6-methylpregna-4,6-diene-20-one or its esters as progestagen at effective doses. Also, the proposed agent can contain additionally the preliminary micronized natural or synthetic estrogen, for example, ethinylestradiol, estradiol esters, diethylstilbestrol. EFFECT: enhanced effectiveness of agent. 2 cl, 1 tbl
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