Determination of the factors influence on the content of inosinic acid and glutamic acid in Japanese Black beef and condition of fattening to improve them (the 1sup(st) report)
2018
Endo, A. | Taga, C. | Sasaki, K.
The aim of this study was to investigate the factors influence on the inosinic acid and glutamic acid contained in beef. The longissimus thoracis muscles of 262 Japanese black carcasses were sampled and used for analysis of inosinic acid and glutamic acid. As the result of this analysis, the carcasses of heifer contained more inosinic acid than that of steers (P < 0.05), whereas there was no significant difference within pedigree. The carcass of cattle slaughtered at age 24 and 25 months showed higher content of inosinic acid than that at age 27 and 28 month. The content of glutamic acid was high in the carcass of cattle slaughtered at age between 24 and 26 months, and was less as slaughtered age increased up to age of 28 months; therefore this might indicate that the content of both inosinic acid and glutamic acid in carcass of heifer slaughtered at age 25 months could be high. Following that, we examined whether the conditions of fattening have influences on the content of inosinic acid and glutamic acid in carcass. 3 groups of heifer were set in this study; the earlier fattening group, the exercise group and the control group. The heifer in the earlier fattening group were started feeding fattening fodder at 11 months old and the heifer in the exercise group could move freely in the barn and 500 square m of paddock. The average weight of heifer in the earlier fattening group was the highest in 3 groups at age 16 months. The moved distance of heifer in the exercise group was twice as long as that in the control group.
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