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The Effect of Specific Dietary Fats on the Blood Lipids of Lactating Goats¹

Laboratory of Animal Nutrition, Cornell University, Ithaca, N. Y.

ABSTRACT

The total lipids, phospholipids, free and combined cholesterol and the iodine numbers of the total lipids have been determined in the plasma and cells of the blood of lactating goats receiving in one period a nearly fat-free ration and in other periods the same ration plus certain oils and fatty acids. The fat-free diet consisted of an extracted grain mixture, regenerated cellulose, starch, molasses, extracted yeast, an A-D concentrate and a mineral mixture. The oils and acids used were butter oil, coconut oil, palmitic and stearic acids, and oleic and linoleic acids.

In the plasma the total lipids, phospholipids and total and free cholesterol dropped gradually on the fat-free diet and rose on the diets containing the fat additions irrespective of the nature of the fat fed. The iodine numbers of the total lipids in the plasma fell on the fat-free diet. With the inclusion of fat in the diet these numbers tended to change in the direction expected on the basis of the iodine number of the fat fed. In the cells the various lipid values tended to remain constant and showed no changes which could be correlated either with the nature of the diet or the changes in the plasma. The cholesterol in the cells was almost entirely in the free state while in the plasma it was present chiefly in the combined form.

In general this blood picture is similar to that reported for non-lactating animals of other species. It thus appears that the constant withdrawal of blood lipids for the secretion of milk does not alter the essential nature of the changes in these lipids which are brought about by changes in the diet.

¹ The data presented are taken from a thesis offered by H. H. Williams to the Graduate School of Cornell University in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

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				W. Sansalone Harold Henderson Williams (1907–1991) J. Nutr., March 1, 1999; 129(3): 591 - 595. [Full Text]