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Relationship between numbers of α2- and β2-adrenoceptors on blood cells of bulls and milkability of their daughters

Published online by Cambridge University Press:  01 June 2009

Eddy Roets ,
Christian Burvenich  and
Jorn Hamann
Eddy Roets
Affiliation:
Department of Veterinary Physiology, Biochemistry and Biometrics, Faculty of Veterinary Medicine, University of Ghent, Salisburylaan 133, Building A, B-9820 Merelbeke, Belgium
Christian Burvenich
Affiliation:
Department of Veterinary Physiology, Biochemistry and Biometrics, Faculty of Veterinary Medicine, University of Ghent, Salisburylaan 133, Building A, B-9820 Merelbeke, Belgium
Jorn Hamann
Affiliation:
Federal Dairy Research Centre, Institute for Hygiene, D-24103 Kiel, Germany
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Summary

Milk yield and milking time were measured on one occasion for several daughters (n = 6–44) from 16 bulls at morning milkings. Blood from the bulls was collected, and platelets and mononuclear leucocytes were isolated. The α2-adrenoceptors on platelet membranes were identified by binding of [3H]rauwolscine, whereas for the determination of β2-adrenoceptors on intact mononuclear leucocytes, [3H]CGP–12177 was used. It was found that mean milk flow rate was highly correlated (P < 0·001) with the α2-adrenoceptor densities on blood platelets. No correlation was found with the β2-adrenoceptors on mononuclear leucocytes. It is concluded that estimation of the α2-adrenoceptors on blood platelets from bulls could eventually be used to investigate milking characteristics of cows, and might be useful in the future as a marker in genetic studies.

Type
Original Articles
Information
Journal of Dairy Research , Volume 62 , Issue 4 , November 1995 , pp. 567 - 575
Copyright
Copyright © Proprietors of Journal of Dairy Research 1995

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References

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