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533. Intramammary pressure changes in the lactating sow: I. The effect of oxytocin

Published online by Cambridge University Press:  01 June 2009

W. G. Whittlestone
W. G. Whittlestone
Affiliation:
Ruakura Animal Research Station, Department of Agriculture, New Zealand
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Extract

Using an electronic pressure recording system, pressure changes in the sow's mammary gland in response to injections of oxytocin and whole pituitrin have been recorded. The results suggest that an injection of oxytocin within physiological range may pass round the circulatory system twice, resulting in a small secondary pulse of pressure. Slow injections over periods of the order of 8–16 sec. are shown to produce a double rise in pressure, the two phases of which are of the same order of magnitude, suggesting a contraction followed by a period of relaxation and a further contraction.

Type
Original Articles
Information
Journal of Dairy Research , Volume 21 , Issue 1 , February 1954 , pp. 19 - 30
Copyright
Copyright © Proprietors of Journal of Dairy Research 1954

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References

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