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Hour-to-hour variation in amino acid arterio-venous concentration differences across the lactating goat mammary gland

Published online by Cambridge University Press:  01 June 2009

T. B. Mepham  and
J. L. Linzell
T. B. Mepham
Affiliation:
University of Nottingham, Faculty of Agricultural Science, Sutton Bonington, Loughborough, LE12 5RD
J. L. Linzell
Affiliation:
A.B.C. Institute of Animal Physiology, Babraham, Cambridge
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Summary

Arterio-venous (AV) blood plasma concentration differences of amino acids across the mammary glands of 2 lactating goats were measured at intervals throughout a day. One gland of each animal had been transplanted to the neck for experimental purposes. The variation throughout the day in arterial concentration of all amino acids was similar. The variation in AV differences was slight for most essential amino acids, greater for glutamic acid and proline and very marked for aspartic acid, alanine, glycine and citrulline. There was no statistical difference between the AV difference of any amino acid measured simultaneously across the 2 glands of either goat. The arterial concentrations of certain pairs of amino acids were significantly correlated. The implications of the results for estimation of rates of amino-acid synthesis in the mammary gland using the intra-arterial infusion technique are discussed.

Type
Research Article
Information
Journal of Dairy Research , Volume 41 , Issue 1 , February 1974 , pp. 95 - 100
Copyright
Copyright © Proprietors of Journal of Dairy Research 1974

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References

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