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Journal of Animal Science, Vol 68, Issue 11 3654-3662, Copyright © 1990 by American Society of Animal Science

JOURNAL ARTICLE

Effects of high-temperature conditioning on enzymatic activity and tenderness of Bos indicus longissimus muscle

G. Whipple, M. Koohmaraie, M. E. Dikeman and J. D. Crouse
Dept. of Anim. Sci. and Ind., Kansas State University, Manhattan 66506.

We studied the effects of high-temperature conditioning (HTC) on beef longissimus (LM) and semitendinosus muscles. Eleven 5/8 Sahiwal x Angus, Hereford or Angus x Hereford crosses (seven heifers and four steers) were slaughtered. Alternate carcass sides were held at 22 +/- 3 degrees C for 6 h, then chilled at -1 degree C for 18 h. The opposite, control (C) sides were chilled at -1 degree C for 24 h. Samples were removed only from the LM at various times to determine calcium-dependent protease (CDP) and CDP inhibitor (INH) activity, cathepsins B and B + L activity, shear-force, sensory panel traits, myofibrillar fragmentation index (MFI) and sarcomere length. Results were analyzed by least squares procedures; our model included fixed effects of temperature, sex and their interaction. The LM temperature remained higher (P less than .01) for the HTC treatment at 3, 6, 9 and 12 h postmortem. In addition, HTC increased the rate of pH decline which resulted in pH differences (P less than .01) at 6, 9 and 12 h. At d 1, LM steaks had lower (P less than .05) shear forces (8.3 vs 9.6 kg) from HTC than C carcasses. At d 14, LM shear forces tended (P = .13) to be lower for HTC (6.9 kg) than for C (7.7 kg) carcasses. At, 3, 7 and 14 d, MFI for LM were greater (P less than .07) for the HTC steaks. However, by 6 h postmortem, INH activity had decreased (P less than .10) 35% in HTC samples, but no change had occurred in C samples (P less than .10).(ABSTRACT TRUNCATED AT 250 WORDS)


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D. A. King, M. E. Dikeman, T. L. Wheeler, C. L. Kastner, and M. Koohmaraie
Chilling and cooking rate effects on some myofibrillar determinants of tenderness of beef
J Anim Sci, June 1, 2003; 81(6): 1473 - 1481.
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