Estimation of genetic parameters for muscle area, subcutaneous fat of carcass cross section in Japanese black cattle
2004
Oosawa, T. (Obihiro Univ. of Agriculture and Veterinary Medicine, Hokkaido (Japan)) | Hasegawa, M. | Kuchida, K. | Hidaka, S. | Sekikawa, M. | Tsukada, H.
The purposes of this study were to investigate the relationship among major muscle areas, subcutaneous fat (SF) and intermuscular fat (INF) of carcass cross section by image analysis, and to predict genetic parameters of those traits. Digital images of carcass cross section, grading records, and pedigree records for 404 Japanese Black steers in progeny testing were used. Areas and marbling percentages (MAP) in M. longissimus dorsi (LONG), M. trapezius (TRAP) and M. latissimus dorsi (LATIS), and sectioned areas of SF and INF were measured by the image analysis method. Percentages of each area to the entire cross sectional area were also calculated. Heritability estimates of the percentages for SF (0.58-0.72) and INF (0.37-0.71) ranged from moderate to high. Genetic correlation between the percentages for SF and INF was low (0.15). Genetic correlations between SF and MAP in LONG, which has a strong relationship with the BMS number, were negative (-0.28 to -0.08), while those between the percentages for MAP in LONG and INF were positive (0.17-0.22).
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