Relationships between Muscle α-Tocopherol Concentrations and Metmyoglobin Percentages during Display of Six Muscles of Japanese Black Steers

  • Muramoto, T. (Department of Integrated Research for Agriculture, National Agricultural Research Center for Tohoku Region) ;
  • Shibata, M. (Department of Livestock and Grassland Science, National Agricultural Research Center for Western Region) ;
  • Nakanishi, N. (Department of Animal Feeding and Management, National Institute of Livestock and Grassland Science)
  • Received : 2003.08.26
  • Accepted : 2004.03.16
  • Published : 2004.07.01


Relationships between muscle $\alpha$-tocopherol oncentrations and metmyoglobin percentages during display of six muscles, m. serratus ventralis (SV), m. psoas major (PM), m. gluteus medius (GM), m. semimembranosus (SM), m. semitendinosus (ST) and m. longissimus lumborum (LL), of Japanese Black steers slaughtered at 28 months of age were studied. Steers were supplemented with 0, 2,000 and 4,000 mg $\alpha$-tocopheryl acetate/head/day for 28 days prior to slaughter in the VE 0, the VE 2,000 and the VE 4,000 groups, respectively. $\alpha$-Tocopherol concentrations in PM, GM, SM, ST and LL of the VE 2,000 and the VE 4,000 groups were significantly (p<0.05) higher than those of the VE 0 group. There were no significant (p>0.05) differences in $\alpha$-tocopherol concentrations in all muscles between the VE 2,000 group and the VE 4,000 group. The muscle $\alpha$-tocopherol concentrations ($\ell$/g meat) which can retard metmyoglobin formation in muscles were estimated to be 5.3 for SV, 4.5 for PM, 4.2 for GM, 4.0 for SM, 3.6 for ST and 3.5 for LL. The equation to predict color-shelf-life of each muscle from the $\alpha$-tocopherol concentration in each muscle could be obtained.


Beef;$\alpha$-Tocopherol;Metmyoglobin;Color-shelf-life;Japanese Black Steers


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