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Influence of Sex, Liveweight and Anatomical Location on Bovine Lipids. I. Fatty Acid Composition of Subcutaneous and Intermuscular Fat Depots^{1, 2,}

University of Wisconsin, Madison

Abstract

Six subcutaneous and one intermuscular fat depots were sampled from 16 Angus steers and 15 Angus heifers fed, ad libitum, a concentrate ration from weaning to an end point weight of either 386, 420 or 455 kilograms. Statistical analysis was based on a weight, by sex, by depot (anatomical location) model. Individual fatty acids were determined by GLC and expressed as relative percentages of the total acids measured. There were more differences in fatty acid composition due to sex than either liveweight or depot site alone. Steers had a more saturated fat than heifers with steers containing larger percents of C10 (P<.05), C14 (P<.01), C16 (P<.01) and C18 (P<.05), while heifers had a larger percent of C18:1 (P<.05). Weight groups only affected the short chain acids. The 455 kg. weight group had larger percents of C10 (P<.01) and C12 (P<.01) but a smaller percent of C14 (P<.05) than the 386 kg. weight group. Depot site contributed to differences among the major acids of C16:1, C18:1 and C18. The OSTB had the largest percents of C16:1 (P<.01) and C18:1 (P<.05) while the SEAM had the largest percent of C18 (P<.01).

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station, Madison.

² Department of Meat and Animal Science manuscript No. 518.

³ Present address: Cooperative Extension Service, Auburn University, Auburn, Alabama 36830.