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Inhibitory effect of adrenaline on oxytocin release in the ewe during the milk-ejection reflex

Published online by Cambridge University Press:  01 June 2009

Tadeusz Barowicz
Tadeusz Barowicz
Affiliation:
Department of Animal Physiology, Institute of Zootechnics, 32-083 Balice near Cracow, Poland
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Summary

Milk-ejection activity was determined in the blood plasma of ewes during normal milking and during milking when adrenaline was injected intravenously before or after udder stimulation. It was found that administration of adrenaline either before or after udder washing, decreased the oxytocin concentration and milk yield but increased the yield by hand-stripping. Adrenaline also retards the average time for peak oxytocin concentration. These results and the use of a β-receptor blocker to inhibit the effect of adrenaline at the myoepithelial cell level indicate that in ewes adrenaline can prevent the release of oxytocin from neurohypophysis.

Type
Original Articles
Information
Journal of Dairy Research , Volume 46 , Issue 1 , January 1979 , pp. 41 - 46
Copyright
Copyright © Proprietors of Journal of Dairy Research 1979

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