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

Muramoto, T.; Shibata, M.; Nakanishi, N.

doi:2004.17.7.1014

Article

Animal Breeding and Genetics

Asian-Australasian Journal of Animal Sciences 2004;17(7): 1014-1018.
https://doi.org/10.5713/ajas.2004.1014 Published online January 1, 2004.

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

T. Muramoto, M. Shibata, N. Nakanishi

Abstract

Relationships between muscle 慣-tocopherol concentrations 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 慣-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. 慣-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 慣-tocopherol concentrations in all muscles between the VE 2,000 group and the VE 4,000 group. The muscle 慣-tocopherol concentrations ( g/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 慣-tocopherol concentration in each muscle could be obtained.

Keywords: Beef; 慣-Tocopherol; Metmyoglobin; Color-shelf-life; Japanese Black Steers