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NEUROHYPOPHYSIAL HORMONES AND THE EMISSION OF SEMEN IN RABBITS

Summary.: To elucidate the importance of the neurohypophysial hormones for the emission of semen, several neurohypophysial peptides were tested in male rabbits and the sperm density in the ejaculates was determined. Besides oxytocin and vasopressin, vasotocin and one oxytocin analogue (de-amino¹-oxytocin) were used. Only vasopressin, in a dose as low as 10 mU, increased the number of spermatozoa in the ejaculates. It is suggested that vasopressin is of physiological significance for the emission of semen, at least in rabbits.

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