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Journal of Nutrition Vol. 101 No. 10 October 1971, pp. 1343-1349
Copyright © 1971 by American Society for Nutrition
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Fatty Acid Oxidation in Young Pigs1,2,3,

G. M. Miller4, J. H. Conrad, T. W. Keenan and W. R. Featherston

Department of Animal Sciences, Purdue University, Lafayette, Indiana 47907

Lipid metabolism in the very young pig previously has been investigated largely through studies of digestibility of intact fats. The present experiments were conducted to determine the ability of the young pig to utilize individual fatty acids when differences due to digestion and absorption were eliminated. Relative rates of oxidation of intramuscularly injected 1-14C-lauric, palmitic, oleic and linoleic acids to 14CO2 and the incorporation of these fatty acids into tissue lipids were studied with 48 pigs, 1 or 7 days of age. Laurate was oxidized to 14CO2 more rapidly than any of the other administered acids. Oleate was oxidized slightly more rapidly than was linoleate. Liver phospholipids from pigs of both age groups contained the largest amount of radioactivity when linoleate was administered. There was very little accumulation of radioactivity in tissue lipid fractions when laurate was administered. No significant differences in oxidation rates of fatty acids were observed when 1- and 7-day-old pigs were compared. In a second experiment, the distribution of radioactivity from injected palmitate, oleate and linoleate in serum and tissue lipid fractions of 1-day-old pigs was determined. Serum phospholipid and diglyceride as well as serum, liver and carcass free cholesterol fractions contained the greatest amount of radioactivity when linoleate was administered. The highest level of radioactivity in the cholesterol ester fraction was observed when oleate was administered. These studies suggest that the oxidation of fatty acids was not a limiting factor in lipid utilization in very young pigs.

1 This material was taken from a thesis submitted to the Graduate School, Purdue University, in partial fulfillment of the requirements for the Doctor of Philosophy degree and was presented, in part, at the 62nd Annual Meeting of the American Society of Animal Science, August, 1970, held at Pennsylvania State University, University Park, Pa.

2 Purdue University AES Journal Paper no. 4113.

3 This research was supported in part by a grant from the Purdue Research Foundation.

4 Present address: Allied Mills Research Center, Libertyville, Ill.

Manuscript received 2 February 1971.


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