The Role of Exogenous Oxytocin in Lactating Ewe
نویسنده
چکیده
The effect of exogenous oxytocin on milk yield is studied in a series of experiments on the dairy ewe. Experiments I and II. A non-galactokinetic dose (o.oi and 0.5 IU/hr) injected into the carotid artery did not change milk yield. The results do not seem to confirm central oxytocin action on the lactogenic hormonal complex of the hypophysis. Experiments III, IV, V. IV injection of oxytocin (0.1 to 2 IU) only had a tonic effect on milk yield when followed by extraction of the residual milk produced. Experiments III, IV, VI and VII. The tonic effect of oxytocin on milk secretion is confirmed even when it is injected IV in high doses (0.1 to 10 IU) after each milking. At the same time, oxytocin is also shown to have an inhibitory effect on natural milk ejection
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