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거세 및 출하월령이 한우와 홀스타인 비육우의 도체구성과 부분육량에 미치는 영향
성삼경(S . K . Sung),정근기(K . K . Jung),최창본(C . B . Choi),김대곤(D . G . Kim),김성겸(S . G . Kim),김덕영(D . Y . Kim),최봉재(B . J . Choi) 한국축산학회 1996 한국축산학회지 Vol.38 No.3
The purpose of this study was to investigate the effects of breed, sex, and age on carcass composition and retail yield percentage of Hanwoo and Holstein steers and bulls reared under the same feed and feeding conditions. Lower percentages of bone and higher percentages of fat were observed in Hanwoo and steers compared with Holsteins and bulls, respectively. There were no differences in muscle percentage between breeds, whereas bulls showed higher muscle percentage than steers. The ratio of muscle to bone was higher in Hanwoo and bulls than in Holsteins and steers, respectively. The percentages of ribloin, brisket and flank, and rib with bone and fat were higher in Hanwoo, whereas the percentages of round, top round, and shank were higher in Holsteins. In Hanwoo, steers yielded more tenderloin, rib and shank than bulls. As age progressed, bone percentage decreased in Hanwoo, while no apparent changes were observed in Holsteins and fat percentage increased regardless of breeds. As age advanced, the percentages of ribloin and sirloin increased in Hanwoo steers, whereas those of sirloin and top round tended to decrease and brisket and flank increased in Holstein steers.
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.
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.
사료내 구리및 유황의 공급원이 브로일러의 생산성에 미치는 효과
고영길,한인규,하종규,김성겸 ( Y . G . Ko,In K . Han,J . K . Han,S . K . Kim ) 한국축산학회 1985 한국축산학회지 Vol.27 No.10
As a preliminary study to clarify whether growth promotion effect of dietary copper sulfate is due to either copper canon, sulfate, or to the whole copper sulfate salt, 3 day old broiler chicks were fed the experimental diets containing graded levels of DL-methionine, copper sulfate, copper carbonate and sodium sulfate for 3 weeks. Chicks fed copper carbonate failed to show normal performance and showed significantly higher mortality. Although statistics did not show any significance, chicks fed higher levels of the three other materials showed slightly improved performances eventhough they were fed together with antibiotics. It could be inferred that dietary copper alone or copper without being combined to sulfate cannot stimulat chick`s growth at all.
거세가 한우 및 홀스타인 비육우 도체의 이화학적 특성에 미치는 영향
김대곤,정근기,성삼경,최창본,김성겸,김덕영,최봉재 한국축산학회 1996 한국축산학회지 Vol.38 No.3
As an approach to producing high quality carcasses in terms of physico-chemical properties, histochemical properties, and sensory evaluations, this study was curried out to compare carcass characteristics of Hanwoo with Holsteins and that of stem with bulls reared under the same feed and feeding conditions. In Hanwoo steers, moisture content was lower while etude fat was higher than in Hanwoo bulls and Holstein steers and bulls. Water holding capacity and L value of rib loins were higher in steer than in bulls. Collagen content was higher in Hanwoo and in bulls than in steer. The degrees of hardness and chewiness in steers were significantly lower than those in bulls. The carcass of Hanwoo steer possessed higher oleic acid and unsaturated fatty acid and lower palmitic acid and saturated fatty acids than those of Holstein steers. The carcasses of Hanwoo steers yielded significantly higher oleic acid than that of Holstein steers. Hanwoo contained more I-R and II-W type of muscle fiber, than Holsteins while Holsteins contained more II-R type than Hanwoo. Steers contained more II-W type than bulls. Diameters of all types of muscle fibers were larger in Hanwoo than in Holsteins regardless of sex, and steers tended W have smaller diameters of muscle tiber than in Hanwoo bulls. Steers of Hanwoo ,how ed remarkably higher scores in sensory evaluations based on tenderness, juiciness, flavor and acceptability than hulls. The above results indicate that castration is essential to produce high quality beef.