| Abstract: | The action of synthetic oxytocin and Glanduphen, a neurohypophyseal extract preparation, on the diuresis of six heads of cattle in lactation was studied, following intraruminal application of water. Intravenous injection of something between 10 and 30 I.U. of oxytocin reduced diuresis by 54 per cent on average, within 30 minutes from treatment. Urine-borne Cl- -concentrations went up by 315 per cent on average and quantitative Cl- -secretion by 87 per cent. The values recorded in response to the administration of doses between 10 and 40 I.U. of Glanduphen were 44, 785, and 344 per cent. Additional application of Glanduphen within 30 minutes from oxytocin injection caused less pronounced inhibition of diuresis or even some activation of diuresis. Literature on renal effects of vasopressin and of oxytocin was analysed, in that context, and the conclusion was drawn that antidiuretic effects were recordable neither from man nor from animals unless they were exposed to excessive application of water. The same hormone preparations, however, caused increase of diuresis in thirty animals with low rates of diuresis and higher osmotic urine pressure. Rise in saluresis was a most common result of vasopressin or oxytocin administration and did in no way depend on the diuresis level. |
