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Journal of Dairy Science Vol. 55 No. 1 83-92
© 1972 by American Dairy Science Association ®
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Metabolism of Fatty Acids by Adipose Tissue and Liver of Cows Fed Normal, Restricted Roughage or MgO Supplemented Rations1

J. D. Benson2, E. W. Askew3, R. S. Emery and J. W. Thomas

Dairy Science Department, Michigan State University, East Lansing 48823

ABSTRACT

Two Latin square experiments used 11 lactating cows to study dietary effects on fatty acid metabolism in serum, liver, and adipose tissue. Lipoprotein lipase and fatty acid esterifying activities from adipose tissue homogenates were increased and milk fat depressed when the ration was switched from normal to restricted-roughage, high-grain. Fatty acid esterification in liver was correlated (r = .89) with milk fat concentration but was not uniformly affected by ration. Mammary gland uptake of triglycerides from dextran sulfate precipitable lipoproteins and milk fat percentage was greater for cows fed MgO supplemented rations than for cows fed the other rations. The proportion of stearic acid decreased and C18:1 increased in the dextran sulfate precipitable lipoprotein triglycerides for cows fed restricted-roughage, high-grain rations compared to those fed other rations. Only stearic acid was selctively assimilated by the mammary gland. Cholesterol linoleate increased in the dextran sulfate precipitable lipoproteins when rations were switched from normal to restricted-roughage, high-grain. Changes in both serum lipids and tissue enzymes are associated with an increased flux of fatty acids toward adipose tissues during restricted-roughage, high-grain feeding.

FOOTNOTES

1 Published as Michigan State Agricultural Experiment Station Journal Article 5525. Partially supported by NTH Training Grant GMO-1818 and Research Grant AM 13177.

2 Data presented are taken from a Ph.D. thesis submitted by the senior author to Michigan State University. Present address: Letterman Army Institute of Research, Presidio of San Francisco,California 94129.

3 Present address: United States Army Medical Research and Nutrition Laboratory, Fitzsimons General Hospital, Denver, Colorado 90240.






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Copyright © 1972 by the American Dairy Science Association ®.