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Characterization of Certified Angus Beef steaks from the round, loin, and chuck

J. L. Nelson^*, H. G. Dolezal, F. K. Ray^* and J. B. Morgan^*,1

^* Department of Animal Science, Oklahoma State University, Stillwater 74078 and and Excel Corp., Wichita, KS 67202-1410

¹ Correspondence: 104 Animal Science (phone: 405-744-6616; fax: 405-744-7390; e-mail: bmorgan{at}okstate.edu).

Abstract

Beef carcasses (n = 150) of A-maturity were selected randomly to determine baseline shear force and sensory panel ratings, assess variation in tenderness, and evaluate mean value differences between Certified Angus Beef (CAB), commodity Choice, and Select steaks. Three steaks were removed from the triceps brachii (TB), longissimus lumborum (LL), gluteus medius (GM), semimembranosus (SM), biceps femoris (BF), and quadriceps femoris complex (QF), and assigned to Warner-Bratzler shear (WBSF) and sensory panel analyses. As anticipated, marbling score and measured percentage of i.m. fat were greatest (P < 0.05) for CAB, intermediate (P < 0.05) for Choice, and least (P < 0.05) for Select carcasses. A muscle x quality level interaction (P < 0.05) was observed for WBSF values and sensory panel tenderness ratings. The TB, LL, GM, and BF steaks from CAB carcasses had lower (P < 0.05) WBSF than Select steaks from the same muscles. Even though WBSF values did not differ (P > 0.05) between CAB and Choice QF and TB steaks, the LL and GM steaks from CAB carcasses were more tender (P < 0.05) than Choice-grade LL and GM steaks. The TB from Select carcasses had higher (P < 0.05) WBSF values than TB steaks from CAB or Choice carcasses, but sensory panel ratings indicated that quality level showed little consistency among the GM, SM, BF, and QF. Trained sensory panelists rated CAB LL steaks more tender (P < 0.05) than LL steaks from Choice and Select carcasses, and Choice LL steaks were evaluated as more (P < 0.05) tender than those from Select carcasses. These results demonstrate that the influence of marbling on tenderness was more evident in muscles of middle meats than in end cuts, particularly in muscles of the round.

Key Words: Beef • Marbling • Quality Grade • Tenderness

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				S. L. Gruber, J. D. Tatum, J. A. Scanga, P. L. Chapman, G. C. Smith, and K. E. Belk Effects of postmortem aging and USDA quality grade on Warner-Bratzler shear force values of seventeen individual beef muscles J Anim Sci, December 1, 2006; 84(12): 3387 - 3396. [Abstract] [Full Text] [PDF]