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Comparative Studies on Metabolic Rate and Calpain/Calpastatin Activity between Hanwoo and Holstein Beef |
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M. S. Rhee, Y. C. Ryu, B. C. Kim |
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| Abstract |
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The objectives of this study were to examine the effect of early short-term temperature conditioning on metabolic rate and calpain/calpastatin system and to compare variations in metabolic rate and calpain/calpastatin system between Hanwoo and Holstein beef. Longissimus thoracis et lumborum of the right carcass from 3 Hanwoo and 3 Holstein bulls were removed within 30 min of exsanguinations, cut into three pieces, and then temperature conditioned until 3 h postmortem (PM) at 2, 16, and 30 C, respectively. Rigor values (R-values; R248, R250, and R258), pH, muscle temperature, glycogen content, - and m-calpain activities, and calpastatin acitivity were measured at 1, 3, 9, and 24 h PM, respectively. Hanwoo beef had higher muscle temperature, faster metabolic rate at early PM stage in R-values, and lower -calpain activity than Holstein beef (p<0.05). The 30 C treatment maintained muscle temperature of 30 C until 3 h PM and resulted in faster pH decline at 3 and 9 h PM (p<0.05) than other treatments. The 16 C had higher (p<0.05) muscle temperature at 3 h PM than the 2 C, but no difference in all other traits was observed between the 2 C and the 16 C. Early short-term temperature treatment used in this study was not sufficient to effectively activate calpain/calpastatin system. Correlations among all traits except m-calpain and muscle temperature were generally high (r>0.60; p<0.001). Among R-values, R258 had higher correlations with other metabolic traits than those of R248 and R250. These data suggest that early PM metabolic rate, -calpain activity, and calpastatin activity may be closely related to each other. Variations in metabolic rate and -calpain activity at early PM stage between Hanwoo and Holstein beef may imply variations in meat quality between both breeds. |
| Keywords:
Hanwoo Beef; Holstein Beef; Temperature Conditioning; Metabolic Rate; Calpain; Calpastatin |
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