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Influence of Sex, Liveweight and Anatomical Location on Bovine Lipids. II. Lipid Components and Subjective Scores of Six Muscles^{1, 2,}

University of Wisconsin, Madison

Abstract

Six muslces, differing widely in anatomical location and physiological function were sampled from 17 Angus steers and 18 Angus heifers (described in Part I of this series). Lipid components (extractable lipid, lipid phosphorus and cholesterol) as well as subjective scores (marbling, marbling distribution and color) were determined for each of the following muscles: (1) Semitendinosus, (ST), (2) Semimembranosus, (SM), (3) Transversus abdominis, (TA), (4) Longissimus dorsi, (LD), (5) Psoas major, (PM) and (6) Triceps brachii, (TB). Significant muscle differences were observed for extractable lipid and lipid phosphorous. The PM had larger percentages of extractable lipid than the LD (P<.05). The ST had the smallest amount of extractable lipid (P<.05). A significant (P<.05) weight groupxsex interaction was observed for extractable lipid. Lipid phosphorous content was larger in the TB and PM (P<.05) than in other muscles. There were no muscle differences in total cholesterol; however, a significant (P<.05) weight group difference was observed. Muscle differences in marbling, marbling distribution and color scores were significant. The LD and SM had the highest scores for marbling and marbling distribution (P<.05). Sex differences (P<.05) in marbling distribution were also reported (steers were more uniformly marbled than heifers). These data indicate that individual muscles have a greater influence on differences in lipid components and subjective scores than either liveweight or sex.

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

² Department of Meat and Animal Science Manuscript No. 532.

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