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김내수,원유석,송만강,최양일,정정수,이창림,정재경,임진희 한국축산학회 1999 한국축산학회지 Vol.41 No.6
The current study was undertaken to determine the effects of growing age on the carcass, meat quality and muscle fiber characteristics in Hanwoo bulls during the growing period of 6 to 30 months. A total of 54 heads of Hanwoo bulls (6 heads of 6 months, 12 heads each of 14, 18, 24 and 30 months) were conventionally slaughtered at each age, and then chilled overnight. The carcass characteristics and quality or yield grade (QG or YG) were determined on those carcasses, longissimus muscle (3Kg) was removed from left sides at 1st to 5th lumbar vertebrate and meat qualities or muscle fiber characteristics were evaluated. In the carcass characteristics of Hanwoo bulls, live weight, carcass weight and ribeye area except backfat thickness and dressing percent were increased(P $lt; 0.05) until 24 months of age. The backfat thickness was increased(P $lt; 0.05) from 18 to 24 months of age. The dressing percent was decreased(P $lt; 0.05) from 6 to 14 months, but thereafter slowly increased. Carcasses from 6 or 14 months of age showed A grade of YG, but carcasses from 18 to 30 months showed B grade. In QG, carcasses from 6 or 14 months showed `out of grade' and carcasses from 18 to 30 months showed grade 3 of QG, but the QG was not improved after the 24 months of age. In meat qualities of longissimus muscle, the pH and water-holding capacity tended to be similar except 18 months of age, and the meat color changed to red from 14 to 18 months of age. The shear force was increased(P $lt; 0.05) from 14 to 18 months, but after that decreased(P $lt; 0.05) at 30 months. In proximal analysis, the moisture content was decreased until 24 months of age, but the protein and fat contents tended to increase. In panel test, the flavor score tended to increase but the tenderness or total acceptability score tended to decrease until 30 months of age. In the muscle fiber characteristics, the ratio of white muscle fiber(IIW type) was the largest, and the ratio of intermediate muscle fiber(IIR type) was the smallest except for 6 or 24 months. The ratio of red muscle fiber(IR type) or IIR type tended to decrease, but the ratio of IIW tended to increase until 24 months of age. In the muscle fiber diameter, the IIW type had the largest diameter, but the IR type had the smallest diameter except the I8 or 24 months of age. The diameter of three muscle fiber types tended to increase until 30 months, and the IIW type showed faster increase. In the transmission electron micrographs, muscle fiber from longissimus muscle of 6 months did not show the full development and the A or I band was not fully observed. However, muscle fiber from longissimus muscle of 18 months showed thicker Z-line and the A or I band was fully observed. The longissimus muscle of 24 or 30 months showed the similar morphological pattern of muscle fiber as 18 months of growing age, but the muscle fiber seemed to be fully developed.