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B-mode ultrasonography of mammary glands of cows, goats and sheep during α- and β-adrenergic agonist and oxytocin administration

Published online by Cambridge University Press:  01 June 2009

Rupert M. Bruckmaier  and
Jürg W. Blum
Rupert M. Bruckmaier
Affiliation:
Institut für Tierzucht, Universität Bern, CH-3012 Bern, Schweiz
Jürg W. Blum
Affiliation:
Institut für Tierzucht, Universität Bern, CH-3012 Bern, Schweiz
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Summary

Teat and gland cistern of the mammary glands of five dairy cows, five goats and five sheep were scanned in a water bath during α- and β-adrenergic agonist and oxytocin administration. A 5 MHz linear array scanner was used to create vertical cut pictures with the scan plane longitudinally through the teat channel. The i.v. injection of the α-adrenergic agonist phenylephrine (30 μg/kg) induced diminution of the section area through teat and gland cistern by 38±17% on average within 1 min in all three species. In contrast, the i.v. injection of the β-adrenergic agonist isoproterenol (1 μg/kg) did not change the cisternal areas. The i.v. injection of oxytocin (2·0 × 10−3 i.u./kg) elicited an enlargement of teat and gland cistern area by 48±12% on average. Ultrasonography proved to be a valuable system for visualizing changes of the cisternal volume. Smooth muscle contractions in response to phenylephrine administration are thought to cause area reduction, whereas an expected smooth muscle relaxation after injection of isoproterenol could not be observed by ultrasonography. Milk ejection as induced by oxytocin administration caused dramatic enlargement of the cistern area in all three species.

Type
Original Articles
Information
Journal of Dairy Research , Volume 59 , Issue 2 , May 1992 , pp. 151 - 159
Copyright
Copyright © Proprietors of Journal of Dairy Research 1992

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References

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