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Effect of Dietary and Injected Fat on the Fatty Acid Composition of Bovine Depot Fat and Milk Fat^{1, 2, 3,}

Nutrition and Animal and Dairy Husbandry Sections, Department of Animal Science, North Carolina State College, Raleigh

ABSTRACT

The ingestion of soybean oil by cows resulted in a distinct increase in stearic acid of both milk fat and adipose tissue, but oleic acid increased only in the milk fat. Linoleic acid increased only slightly when soybeans were fed, whereas intravenous infusion of a cottonseed oil emulsion produced a dramatic increase in the linoleate content of milk fat. These findings support the view that dietary unsaturated fatty acids are hydrogenated by the rumen microflora, then deposited by the animal. If the rumen is bypassed, unsaturated fatty acids are deposited without hydrogenation.

¹ Published with the approval of the Director of Research as Paper No. 1483 of the Journal Series.

² This investigation was supported in part by Grant A-2483 from the United States Public Health Service.

³ A portion of this material was presented as part of the Milk Lipids Symposium at the 55th Meeting of the American Dairy Science Association at Logan, Utah. 1960.

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