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한우 및 홀스타인 거세우의 출하월령에 따른 도체의 이화학적 특성변화
김대곤(D . G . Kim),정근기(K . K . Jung),성삼경(S . K . Sung),최창본(C . B . Choi),김성겸(S . K . Kim),김덕영(D . Y . Kim),최봉재(B . J . Choi) 한국축산학회 1996 한국축산학회지 Vol.38 No.3
The current study was conducted to evaulate the effect of age on physico-chemical properties of carcasses obtained from Hanwoo and Holstien steers reared under the same feed and feeding conditions. Hanwoo and Holstien were sacrificed at 20, 22 and 24 months of age, and at 17, 18 and 19 months of age, respectively. In Hanwoo steers, moisture content of the carcass was decreased, while contents of crude fat; water holding capacity (WHC) and collagen increased as age increased. The degree of carcass hardness and chewiness decreased with age. In Holsteins, contents of moisture and crude fat were not influenced by age, whereas a and b values in meat color increased with age. Like the carcass of Hanwoo, the carcass of Holsteins showed in markedly decreased hardness and chewiness as age progressed. When considering the composition of fatty acids, the carcass of Hanwoo showed significantly increased oleic acid, linoleic acid and unsaturated fatty acids and decreased palmitic acid, stearic acid and saturated fatty acids as age increased. But in the carcasses of Holstein, palmitic acid, stearic acid and saturated fatty acids increased, and linolenic acid and unsaturated fatty acids decreased with age.
김재학(J. H. Kim),전경진(K. J. Chun),홍재수(J. S. Hong),김양수(Y. S. Kim),김덕영(D. Y. Kim),임정규(J. K. Im) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Wear of valve seating face and seat insert seating face influence the performance of engine, so they are important. To manufacture good quality valve and seat insert which have wear resistance the relations between wear factors and wear of the two seating faces have to be inspected. Cycle number is one of the important wear factors wearing the two seating faces and it can translate into mileage in rear car. But little is known. Test variable is only cycle number and the cycle numbers are 2.0×10?, 4.0×10? 6.0×10?, 8.0×10?. And the other test conditions were fixed. Rmax of valve seating face and seat insert seating face increase linearly as cycle number is increased. Rmax of valve seating face were smaller than seat insert seating face in each cycle number. Reaction production by tribological reaction and sliding wear was found on the two faces.
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.
In Situ 방법에 의한 국내이용 단백질 사료원에 대한 단백질 분해율에 관한 조사
윤칠석(C . S . Yoon),김덕영(D . Y . Kim),이남형(N . H . Lee) 한국축산학회 1990 한국축산학회지 Vol.32 No.5
The protein degradability of common feedstuffs utilized in Korea was evaluated in situ. The protein degradability was determined in nylon bags suspended in the rumen of sheep for 2, 5, 8, 12, 24, 48 and 72h. The used nylon bags have 625um² of pore size and l2x7cm of bag size. And experimental diets were consisted of 900g concentrates, 400g 3cm-chopped rice straw and 400g alfalfa pellet, and this diet was fed twice a day. The protein degradability of cottonseed oil meal, corn germ meal and coconut oil meal was greatly influenced when the rate of rumen turnover was changed from 0.01/h to 0.10/h. The degradabilities of fish meal, corn gluten meal and meat and bone meal were low compared with other protein feedstuffs. Especially, the degradability of perilla oil meal was similar with fish meal and corn gluten meal and it was evaluated as protein source with low degradability of protein.