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Influence of Dietary Fats upon Carcass Lipid Composition in the Bovine¹

University of Arizona, Tucson 85721

Abstract

SUBCUTANEOUS and intermuscular fat from 10 locations in the carcass as well as lipid from four muscles was obtained in two experiments of 12 animals each. In Experiment I, basal diets were supplemented with 6% animal fat or safflower oil while only animal fat at 0, 5, 10 and 15% was supplemented in Experiment II.

Fatty acid analysis of the subcutaneous and seam fat samples from both experiments revealed that each of the tissues studied (Longissimus subcutaneous, Triceps brachii subcutaneous, Semimembranosus subcutaneous, chuck intermuscular fat, pericardial, heart subcutaneous, mesentary, kidney, brisket and caudal) except brisket fat responded to the dietary treatments in a very similar manner when a response was present. In each of these tissues except brisket fat, the safflower oil feeding regimen caused the depot fat of the animals to become more unsaturated than the controls, whereas the composition of subcutaneous or intermuscular fatty acids changed very little or became more saturated when the diets were supplemented with animal fat. These changes were related to changes noted in the free fatty acid and glyceride lipid fractions of the serum.

¹ Arizona Agricultural Experiment Station Technical Paper No. 2012.

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