Variation of image analysis traits in several muscles of Japanese Black cattle cloned from somatic cells
2008
Nakahashi, Y.(Obihiro Univ. of Agriculture and Veterinary Medicine, Hokkaido (Japan)) | Okumura, T. | Hada, M. | Fujishima, Y. | Yamauchi, K. | Hidaka, S. | Kuchida, K.
Appropriateness of the Japanese beef carcass grading system evaluated mainly at the 6-7th rib-eye was verified using 8 muscle parts (M. semimembranosus, M. quadriceps and M. tensor fasciae latae, M. supraspinatus, M. major psoas, M. gluteus medius and M. biceps femoris, M. longissimus) of five Japanese Black cattle cloned from somatic cells. These muscle parts were sliced at 2 cm intervals from the cranial side to the caudal side. The cranial part from the 6-7th ribs of M. longissimus was categorized as chuck eye and the others as loin. Image analysis was performed for these slices in order to calculate 4 image analysis traits (muscle area, marbling area ratio, overall coarseness index and small flecks index). Correlation coefficients were calculated between image analysis traits of the 6-7th rib-eye as well as those of each muscle to investigate the appropriateness of evaluation at the 6-7th cross section for evaluating the whole carcass. The value of each muscle was calculated as the average of the value of slices for each muscle. Muscle areas increased and decreased toward caudal sides in all muscles. Marbling area ratios fluctuated by muscle. For muscle area and marbling area ratios, correlation coefficients between the 6-7th rib-eye and each muscle showed values over 0.7 in 6 muscles. The correlation coefficient of the marbling area ratios between 6-7th rib-eye and M. semimembranosus was negative (-0.74). There were few muscles that showed high correlation coefficients with 6-7th rib-eye for the overall coarseness and small flecks indices. These results indicated that predicting muscle area and marbling area ratios using the value of 6-7th rib-eye was possible, but predicting coarseness and fineness of marbling for the whole carcass was difficult.
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