[Endocrine mechanisms of the synchronization of the estrous cycle in sheep]

Prostaglandin of the F2-alpha group (estrophan) led to a sharp decrease in serum progesterone concentration of 90-96% of Edibai female sheep eliminating the blocking hypothalamic center effect of the endogenous steroid hormone. The resultant conclusion was a possibility of artificial insemination of the above number of female sheep without finding out signs of wish in them. Their fertility from the first frontal insemination was not below 62-70%.