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Beef Muscle Tenderness as Influenced by Days on Feed, Sex, Maturity and Anatomical Location¹

Texas Tech University, Lubbock^,4

Abstract

Warner-Bratzler shear values were obtained on the triceps brachii, longissimus and semimembranosus muscles of 200 cattle slaughtered at 30-day intervals over a 270-day feeding period. Shear values of all muscles were lower (P<.05) at 150 and 180 days on feed than at all other periods. There was an apparent interaction between time on feed and animal age. The first 180 days on feed had a beneficial effect on tenderness. However, after 180 days, animal age appeared to exert a greater influence. Within treatment differences attributable to sex were small and insignificant. Muscle location had a significant effect on resistance to shear. The triceps brachii muscle had a consistently lower resistance to shearing and the longissimus a higher resistance. Within treatments, the triceps brachii was more tender (P<.05) than the longissimus at 0, 60, 90, 120, 240 and 270 days on feed. The semimembranosus was more tender (P<.05) than the longissimus at 60, 90 and 120 days on feed. No significant differences in tenderness within treatment were observed between the triceps brachii and semimembranosus.

¹ International Center for Arid and Semi-Arid Land Studies Contribution No. 40.

² Present address Department of Animal Science, The Ohio State University, Columbus.

³ Associate Professor, University of Missouri, Columbia.

⁴ This paper is part of a dissertation submitted by the senior author to the Graduate Faculty of the University of Missouri in Partial fulfillment of the requirements for the degree of Doctor of Philosophy in Animal Husbandry.

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