Effects of IARS abnormality carrier sire of Japanese Black cattle on carcass grading and image analysis traits in Hokkaido

MAEDA Sakura, SAKODA Kohei, KUCHIDA Keigo

doi:10.2508/chikusan.85.531

The IARS (isoleucyl-tRNA synthetase) muted gene is responsible for weak calf syndrome in Japanese Black cattle. In this study, carcass grading traits and image analysis traits were analysed to investigate the effects of the use of an IARS abnormality carrier sire on carcass yield and meat quality. Carcass grading and image analysis records of Japanese Black cattle were collected between 2005 and 2013 (n＝11,467) in Hokkaido. Mating patterns were classified according to genotype combinations of sire and maternal grand sire (MGS). There were four different mating patterns: carrier sire and carrier MGS (C × C), carrier sire and normal MGS (C × N), normal sire and carrier MGS (N × C), normal sire and normal MGS (N × N). Least square means of each mating pattern were calculated for all carcass grading and image analysis traits. Comparisons of traits for meat quality, BMS number, marbling area percentage (%) and new fineness index of marbling showed no significant difference between C × C (5.79, 47.11, 77.09) and N × N (6.00, 48.53, 78.09) in steers. Therefore, it is supposed that the IARS mutated gene may have little influence on meat quality of Japanese Black cattle. In addition, carcass weight of C × C was lighter than that of N × N by 27kg in steers. This result suggests that the exclusion of the IARS mutated gene will improve carcass yield without negative impacts on meat quality.

Effects of IARS abnormality carrier sire of Japanese Black cattle on carcass grading and image analysis traits in Hokkaido

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