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거세가 한우 및 홀스타인 비육우의 도체등급에 미치는 영향
정근기(K . K . Jung),김대곤(D . G . Kim),성삼경(S . K . Sung),최창본(C . B . Choi),김성겸(S . G . Kim),김덕영(D . Y . Kim),최봉재(B . J . Choi),윤영탁(Y . T . Yun) 한국축산학회 1996 한국축산학회지 Vol.38 No.3
The study was conducted to investigate the effect of castration on the carcass grade of Hanwoo and Holsteins reared under the same feed and feeding condition. The carcass grading scores were measured by the Korean and Japanese carcass grading standards. The results were compared with respect to Hanwoo and Holstein by sex and Hanwoo and Holstein steers by age. In both grading systems, backfat and lougissimus dorsi of Hanwoo were thicker and larger than those of Holsteins. Steers of both breeds showed thicker backfat and smaller longissinaus dorsi area compared to bulls. Much better carcass yield grade was obtained from Hanwoo than from Holstein, and from bulls than from steers. Hanwoo steers showed significantly higher marbling degree than Hanwoo bulls. As Hanwoo steers aged, backfat thickness and longissimus dorsi area increased. Carcass quality grade of Hanwoo steers increased as age advanced but no apparent changes were found in Holstein steers. When Korean carcass grading standard was applied to judging carcass grade, the steep of Hanwoo resulted in better grade quality of carcasses but a lower quantity of carcass as age increased. Especially, Japanese carcass standard gave better grades with respect to carcass quantity a regardless of breeds and age compared with the Korean standard. In conclusion, the results presented indicate that castration and extended feeding periods (at least 17 months in Holstein and 24 months in Hanwoo) are essential to produce high quality beef, and modification of the current Korean carcass grading standard is necessary to fit carcass characteristics of Hanwoo steers.
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