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김재우(J . W . Kim),여정수(J . S . Yeo),최창본(C . B . Choi) 한국축산학회 1994 한국축산학회지 Vol.36 No.5
In this study, genetic patterns within a family of Korean Native Chickens(KNC) were analyzed. Genomic DNA was extracted from KNC, and digested with the restriction enzyme, Hae III. DNA fingerprinting was applied to the digested DNA using the single stranded bacteriophage M13 DNA as a probe. A parentage tests were carried out with parent offspring. All bands appeared in offsprings were always originated selectively from either parent. Different banding patterns in DNA fingerprints were observed between the parent offspring and unrelated offspring. The results indicate that DNA fingerprinting is a powerful tool for keeping and maintaining pure KNC.
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.
배동호(D . H . Bae),정근기(K . K Jung),최창본(C . B . Choi) 한국축산학회 1988 한국축산학회지 Vol.30 No.10
Six rams (50∼60Kg) fitted with permanent rumen canulae were used in comparison on feed intake, digestibility and chemical characteristics of rumen contents and blood plasma between anhydrous ammonia treated (3%, w/w) rice straw (ATRS) and urea as a source of ammonia treated(6%, w/w) rice straw(UTRS). Animals were fed individually concentrate and treated rice straw twice daily. Concentrate was fed as 1% of body weight throughout the experiment. But the straw was given ad libitum during the first 14 days, and was adjusted for the digestibility period. The results obtained were as follows; 1. The rams fed ATRS increased straw intake and digestibilities of dry matter, crude fiber, CWC and ADF compared to the UTRS. The digestibility of crude protein of the UTRS was higher than that of the ATRS. 2. The diurnal pattern of the PH in rumen juice did not differ between two treatments. 3. The NH₃-N concentrations in rumen contents of the UTRS at 1 hour after feeding intake appeared higher compared to that of the ATRS. The diurnal pattern, however, showed trends to be similar in both treatments. 4. The diurnal patterns of the individual VFA concentration in rumen contents except butyrate were similar between treatments. The butyrate levels of the UTRS showed significantly lower compared to the ATRS at just before feeding, and 3 and 6 hours after feeding. 5. The NH₃-N and Urea-N concentration levels in blood plasma of the UTRS appeared significantly higher compared to that of the ATRS. But it was not enough to reach toxic levels.
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.
여정수(J . S . Yeo),김재우(J . W . Kim),최창본(C . B . Choi) 한국축산학회 1994 한국축산학회지 Vol.36 No.3
This study was conducted to genetically identify chicken breeds, especially the Korean Native Chickens (KNC). Genomic DN.A was extracted from live breeds of chickens, including KNC, and digested with the restriction enzyme, Hae III. DNA fingerprinting was applied to the digested DNA using the single stranded bacteriophage M13 DNA as a probe. There were 6 to 26 hypervariable polymorphic bands, between 0.5 and 8 Kb, in each lane. KNC genomic DNA contained 3 breed-specific bands compared to the other chicken breeds. As the purity determined by phenotypes of KNC increased, these breed-specific bands appeared with higher frequencies. Band shaping ratios among breeds indicated that KNC is closer to an egg-laying breed than a meat type breed. The results indicate that DNA fingerprinting is a powerful tool to identify chicken breeds and to study population genetics. Further studies are necessary to keep and maintain pure KNC using DNA fingerprinting.
배동호(D . H . Bae),정근기(K . K . Jung),최창본(C . B . Choi) 한국축산학회 1988 한국축산학회지 Vol.30 No.8
Experiments were conducted to know effects of urease supplementation and treatment periods on urea hydrolysis, chemical composition and in vitro DM digestibilities (DDM) of the urea-ammonia treated rice straw. A 4x4 factorial design was used. Four main treatments were: (1) rice straw + urea (T₁); (2) rice straw + soyaurease (T₂); (3) T₁ + soya-urease; (4) T₁ + urease. Four treatments periods were 2, 7, 14 and 21 days. The urea was added in an amount of 6% of the air dried rice straw weight, and moisture contents of the treated materials were around 50%. The test materials were tightly enclosed in small plastic bag and stored in room temperature. The results obtained were as follows: 1. The urea treated rice straw supplemented Soya-urease (T₃) or urease (T₄) showed significantly (P$lt;.05) increased NH₃-N concentration and decreased urea-N concentration compared to without urease (T₁) and only urease (T₂). The Soya-urease supplementation resulted in more urea hydrolysis in comparison to urease. 2. The CWC contents in T₃ were least among urea teeated rice straw, but there was nonsignificant difference (P$lt;.05) among them, The CWC contents in T₂ (only urease) appeared significantly high (P$lt;.05) compared to the other plots. The ADF content was not significantly different among main treatments. 3. The average in vvitro DDM of the T₃ was significantly (P$lt;.05) improved compared to the other test plots. And that of the T4 was higher (P$lt;.05) than T₁, and T₂ was lowest among treatments. 4. The NH₃-N and urea-N concentration in treated materials were significantly (P$lt;.01) influenced by treatment periods. The NH₃-N concentration was increased, and the urea-N concentration decreased with prolonged periods. The CWC, ADF and in vitro DDM, however, did not differ among periods. 5. There were noninteraction appeared between main treatment and periods in all parameters except NH₃-N and urea-N concentrations.
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.