This study was conducted to study the environment effects on live weight, carcass weight, dressing percentage, eye muscle area, backfat thickness, and marbling score, which are the carcass traits of Hanwoo, based on the estimates and all the possible regression for the selection of variable and significance test for 231,382 heads that underwent the carcass measurements. The average and standard deviation for the live weight, carcass weight, dressing percentage, eye muscle area, backfat thickness, and marbling score were 654.
As a result of analysis on the effects by the birth season, the carcass weight and body type measurements came out highest, respectively in spring. As a result of the analysis on the effects by the birth location, all of the traits came out highest, respectively in Gangwon.In the majority of carcass weights and body type measurements, statistically significant differences were observed depending on the location of birth.The heritabilities of the carcass weight, chest width and chest girth were estimated as 0.242, 0.221 and 0.264 respectively. These heritabilities of such traits were higher than those of other traits (withers height, rump height, body length etc.).Genetic correlation coefficients were estimated to be 0.944 between wither height and rump height, 0.822 between carcass weight and chest width, 0.769 between carcass weight and chest girth.From the results above, if the carcass weight should be improved by body type measurements of Hanwoo steer, it seemed that such factors as, chest width, chest girth, body length and withers height, which have relatively higher genetic correlations with carcass weight, should be considered.
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