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브로일러 병아리의 등 피부에 312 mm 자외선 조사시 상이한 선량이 혈장내 비타민 D3 함량에 미치는 영향
장윤환(Y . H . Chiang),원지웅(J . W . Won),강훈석(H . S . Kang),김강수(K . S . Kim),여영수(Y . S . Yeoh) 한국축산학회 1992 한국축산학회지 Vol.34 No.3
This study was conducted to elucidate the effect of different dose of 312 nm UV light on plasma vitamin D₃(D₃) content of 3 week old broiler chicks. The 0.32, 0.65 or 0.98 J/㎠ of dose was applied on dosal skin of birds and blood samples were collected day 0, 1, 2, 3, 4 and 5 after UV exposure. The plasma was isolated and D₃ concentrations were analyzed by HPLC. When dorsal skin was exposed to 0.32 J/㎠ of UV dose, the mean plasma D₃ content was 24 ng/㎖ immediately after irradiation and 46 ng/㎖ (peak) at day one after exposure. The D₃ level tended to decrease until day 5 (10 ng/㎖). As 0.65 J/㎠ of UV dose was treated, the D₃ concentrations were 20, 22, 37, 14, 29 and 10 ng/㎖ at day 0, 1, 2, 3, 4 and 5 after irradiation, respectively. When 0.98 J/㎠ dose was applied, the plasma D₃ levels were 25, 25 and 34 ng/㎖ at day 0, 1 and 2, respectively and decreased thereafter. Consequently it was shown that the treatment of 0.32 J/㎠ produced more D₃ in chick plasma than 0.65 or 0.98 J/㎠ did (P$lt;.05).
제라놀(Zeranol) 처리가 한우의 성장 및 혈청대사물질에 미치는 영향
원유석,이성수,정재경,박노형 한국축산학회 1997 한국축산학회지 Vol.39 No.4
Twenty calves averaging 7Mo. of age were used to study the effect of zeranol implants(ZI) on growth, carcass traits and concentrations of hormone and serum metabolites in bulls and steers of Korean cattle. The animal were treated with none or three implants of zeranol at average ages of 7, 10 and 13Mo. There were significant(P$lt;0.05) differences between bulls and steers of control group in live weight, back fat thickness(BF), cold carcass weight and yield grade index. In steers, ZI increased serum IGF-1(Insulin-like growth factor-1) concentration, and resulted in greater live weight(10.5%) and BF(25.4%) compared to those of control. However, it did'nt affect marbling scores(P$gt;0.05). ZI in bullls tended to increase cortisol concentration, marbling scores and BF. The results indicate that zeranol implants had more advantage in steers than in bulls.
한우 미경산우에 대한 난소적출이 발육 및 도체형질에 미치는 영향
원유석,박노형,정준,정재경,임연수,박종관,이문걸 한국축산학회 1999 한국축산학회지 Vol.41 No.5
Five intact control(IC) and 5 ovariectomized heifers(OVX), born in the Livestock Improvement Main Center of National Livestock Co-operatives Federation, were used to study the effects of ovariectomy on growth and carcass traits. Ovariectomy was performed surgically at an average of 6 months old via an incision through the left lumbar fossa area. All heifers were fed concentrates and rice straw based on NLCF's feeding program. Heifers were slaughtered at an average of 24 months old and carcass traits were investigated according to the standard of the Animal Product Grading Service. Physical traits and chemical contents including fatty acids composition and cholesterol concentration in M. longissimus dorsi muscle were examined. Though feed intakes were not different, average daily gain of OVX was higher about 8.4% than that of IC, resulting in improved feed efficiency. The pH of the strip loin from OVX was higher than that of IC(OVX vs IC : 5.43 vs 5.36, P$lt;0.05), however, lowered in cholesterol content(OVX vs IC : 81.76 vs 89.36). Ovariectomy did not affect on tenderness and cooking loss but water holding capacity of the strip loin was higher than IC. Contents of myristic acid, palmitic acid, palmitoleic acid, stearic acid and oleic acid tended to be decreased by OVX, in contrast, linoleic acid was increased. Meat production index(MPI) and meat quality gade(MQG) were not influenced by ovariectomy. All of the OVX got lst grade in the carcass quality grade. Though an ovariectomy was little beneficial effects to improve the MPI and MQG items, overall meat quality grade of OVX was better than IC.
이스트컬쳐(Yeast culture) 급여가 한우의 성장과 도체형질에 미치는 영향
원유석,이성수,정재경,박노형 한국축산학회 1997 한국축산학회지 Vol.39 No.4
Two groups of 20 bulls and 20 steers averaging 9Mo. of age(10 supplemented with yeast culture, YCS and 10 control, C in each group) were used to determine the effect of yeast culture supplementation on growth and carcass traits in Korean cattle. Yeast culture add to diet 20g/d/head during 11∼13Mo. and 15 -17Mo. and 25g/d/head during 20∼22Mo. of age in YCS. Weights at 26Mo. of age were 604.1±16.5, 592.7±16.5 and 538.0±13.5, 515.6±13.5Kg in YCS and C in bulls and steers, respectively. YCS had 1.9% and 4.3% advantage in weight over in bulls and steers. YCS did not affect meat quality grade but affect yield grade in bulls. In contrast, YCS in steers did not affect yield grade but were 5.7㎠ larger in longissimus dorsi area(YCS : 70.5㎠, C : 64.8 ㎠) and 273,138 Won higher in price per head than the counterparts. It appears that the effect of yeast culture supplementation was great in steers but not in bulls.
PCR 기법을 이용한 한우의 κ-casein 과 β-lactoglobulin 유전자의 다형성
원유석,상병찬,신형두,김진호,한성욱 한국축산학회 1997 한국축산학회지 Vol.39 No.5
This study was performed to find genetic polymorphisms of κ-casein and β-lactoglobulin loci in Hanwoo using the PCR-RFLP. Genomic DNA was prepared from the blood of 327 Hanwoo. Amplified products of 530bp and 262bp fragments were obtained from the amplification of K-casein and β-lactoglobulin loci by PCR. The K -casein AA genotype showed a 530bp fragment in amplified products of K -casein loci with the restricted enzyme digestion of Taq I. The κ-casein AB genotype showed 530bp, 3446p and 186bp fragments and BB genotype showed 3446p and 186bp fragments. The β-lactoglobulin AA genotype showed 153bp and 109bp fragments in amplified products of β-lactoglobulin loci with the restricted enzyme digestion of Hae III. The β-lactoglobulin AB genotype showed 153bp, 109bp, 79bp and 74bp fragments and BB genotype showed 109bp, 79bp and 74bp fragments. The κ-casein genotype of Hanwoo gave frequencies of 45.9%, 37.7% and 16.4% for AA, AB and BB types. The rc-casein A and B alleles were 0.647 and 0.353, respectively. The β-lactoglobulin genotype of Hanwoo gave frequencies of 6.4%, 28.8% and 64.8% for AA, AB and BB types. The β-lactoglobulin A and B alleles were 0.208 and 0.792, respectively.
一般 多重選擇 線型背囊問題의 擴張問題에 대한 效率的인 解法
元重淵,鄭聖進 한국경영과학회 1992 한국경영과학회지 Vol.17 No.1
An extension of the generalized linear multiple choice knapsack problem[1] is presented and an algorithm of order 0([n·n_max]^2) is developed by exploiting its extended properties, where n and n_max denote the total number of variables and the cardinality of the largest multiple choice set, respectively. A numerical example is presented and computational aspects are discussed.
원유석,이성수,박노형,김덕임,정지원,이봉식,김찬규 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.5
To establish the system for frozen-semen production, oestrus synchronization, and artificial insemination (AI) in Elk deer, the characteristics of frozen-semen and conception rate by artificial insemination were observed. Semen were collected from 2 heads of elk (Cervus Elaphus canadensis) sire by an electroejaculator and diluted to 0.9- 1.1 X 10^9 sperms/straw with the extender containing glycerol, hydroxymethyl amino methane, citric acid, fructose, and 20% egg yolk. The diluted semen were chilled at 4℃ for 3-4 hours, prefrozen at -140㎏ for 30-40 minutes, and preserved at liquid nitrogen (-196℃). The motility, viability, and abnormality of frozen-thawed semen were 62.4-70.5%, 73.7-75.3% and 6.8-7.3%, respectively. Oestrus was synchronized in 48 heads of hind with progesterone- impregnated intravaginal devices (CIDRs). The CIDRs were removed on Day 14, and 10-250 IU pregnant mare's serum gonadotrophin (PMSG) were given to each hind. Oestrus exhibition rate was 95.8% (46/48). Forty-six hinds, showing oestrus, were artificially inseminated with frozen-thawed semen 60-62 hours after PMSG injection. Pregnancy was detected by ultrasonography at 40 days after Al. The overall conception rate was 78.3% (36/46). These results indicate that the system for frozen-semen production and AI established in this study may be adapted to deer industry.
元重淵,鄭聖進 한국경영과학회 1990 韓國經營科學會誌 Vol.15 No.2
An efficient algorithm is developed for the linear programming relaxation of generalized multiple choice knapsack problem. The generalized multiple choice knapsack problem is an extension of the multiple choice knapsack problem whose relaxed LP problem has been studied extensively. In the worst case, the computational complexity of the proposed algorithm is of order 0((n·n_max)^2), where n is the total number of variables and n_max denotes the cardinality of the largest multiple choice set. The algorithm can be easily embedded in a branch-and-bound procedure for the generalized multiple choice knapsack problem. A numerical example is presented and computational aspects are discussed.