FIELD: veterinary. SUBSTANCE: effective amounts of 3,17-dihydroxy-6-methylpregna-4,6- diene-20-one and its ethers suppress luteinizing hormone in resting state by 25-30%, in proestrus phase by 60-80%, and in estrus phase by 65- 85%; reduce follicle-stimulating hormone in blood in proestrus phase by 10-20% and in estrus phase by 5-10%, while level of gonadoliberine in median hypothalamus mons in proestrus and estrus phases increases by 30-50% and in resting phase by 10-15%. EFFECT: suppressed sexual desire symptoms thereby ensuring contraceptive effect. 3 cl
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