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The metabolism of [U-14C]glucose, [1-14C]palmitic acid and [1-14C]stearic acid by the lactating mammary gland of the sow

Published online by Cambridge University Press:  01 June 2009

J. Spincer  and
J. A. F. Rook
J. Spincer
Affiliation:
Division of Agricultural Chemistry, Department of Agricultural Sciences, University of Leeds
J. A. F. Rook
Affiliation:
Division of Agricultural Chemistry, Department of Agricultural Sciences, University of Leeds
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Summary

(1) Lactating Large White sows were given an intravenous infusion of [U-14C]glucose (3 sows), or of triglycerides containing [1-14C]palmitic acid (1 sow) or [1-14C]stearic acid (1 sow).

(2) The contribution of labelled plasma constituents to the synthesis of milk citrate, lactose, triglyceride glycerol, individual amino acids of the milk proteins and individual fatty acids of the triglyceride fraction was estimated by the ‘transfer quotient’ method. For the glucose infusions the mean values for the transfer quotients were: lactose, 70%; citrate, 42%; glyceride glycerol, 38%; protein, 3%; laurate, 6%; myristate, 12%; palmitate, 6%; palmitoleate, 4% and stearate, 2%. Palmitic acid of the plasma triglycerides made similar contributions of about 60% to the palmitic and palmitoleic acids of milk fat, whereas stearic acid made a major contribution (71 %) to the stearic acid of milk fat but a smaller contribution (42%) to oleic acid.

(3) The results are compared with corresponding values for the goat and the cow.

Type
Original Articles
Information
Journal of Dairy Research , Volume 38 , Issue 3 , October 1971 , pp. 315 - 322
Copyright
Copyright © Proprietors of Journal of Dairy Research 1971

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