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한광진,박영일 ( K . J . Han,Y . I . Park ) 한국축산학회 1985 한국축산학회지 Vol.27 No.6
The economic importance of the three performance traits, average daily gain, feed efficiency and backfat thickness in determining the sale price of performance tested boars was evaluated on the basis of the data from the Korea Boar Testing Station. A total of 54 Duroc, 57 Yorkshire and 36 Landrace boars met qualifying requirements and were sold at the public auctions held each month from July, 1984 to December, 1984. The phenotypic correlations of sale price with average daily gain, feed efficiency and backfat thickness were 0.50, -0.40 and -0.34 in the Duroc, 0.53, -0.29 and -0.39 in the Yorkshire and 0.59, -0.28 and -0.35 in the Landrace. The coefficient of determination in the multiple regression analysis of sale price using the three performance traits as independent variables was 0.51 in the Duroc, 0.48 in the Yorkshire and 0.47 in the Landrace.
한광진(K . J . Han),박영일(Y . I . Park) 한국축산학회 1995 한국축산학회지 Vol.37 No.3
Records from 4,943 Holstein cows containing milk yeild and composition were used to estimate heritabilities as well as genotypic and phenotypic correlations among the milk, fat, protein and SNF yeilds and hulk composition in order to setablish an effectire plum for improrement of Holsteins in Korea. The heritabilities estimated were 0.302 ± 0.046 for milk yield, 0.253 ± 0.042 for fat yield, 0.304 ± 0.047 for protein yield. 0.264 ± 0.043 for SNF yield, 0.277 ± 0.044 for fat percent, 0.334 ± 0.049 for protein percent and 0.245 0.041 for SNF percent. Genetic and phenotypic correlations among the yields of milk, fat, protein and SNF were positive and very high. Milk yield was negatively correlated genetically with the percentages of fat, protein and SNF. Genetic and phenotypic correlations among the percentages of fat, protein and SNF were positive. Results obtained in this study indicate that the milk yield and composition from Holsteins in Korea can be improved by selection and that it is necessary to select for milk yield as well as for composition to in order prevent Vie decline in milk composition as seen when case selection is applied for milk yield only.
신언익(O . Y . Shin),김종복(J . B . Kim),한광진(K . J . Han),박영일(Y . I . Park) 한국축산학회 1990 한국축산학회지 Vol.32 No.4
This study was carried out to estimate the effects of certain environmental factors on body weights, average daily gains, feed efficiency and carcass traits of Korean Native Cattle on the basis of the data from490 heads of Korean Native Cattle tested at the Korean Native Cattle Improvement Centre at Seosan, Chungnam Province from August, 1985 to October, 1987. The results obtained are as follows. 1. The mean values of the body weights and standard error at birth, 6, 12 and 18 months of age were 24.74±0.40kg, 162.60±3.78kg, 346.98±6.15kg and 452.60±6.33kg. respectively. The mean values of the average daily gains for each period of 3, 6, 9 and 12 months after testing were 1.146±0.03kg, 1.050±0.03kg, 0,943±0.02kg and 0.884+0.01kg, respectively. The CP and TDN requirements per kg of body gain were 1.22±0.02kg and 5.73±0.12kg. respectively. And the mean values of the dressing percentage, retailed cuts, cutability and backfat thickness were 59.4±0.5%. 75.17±0.4% 44.38±0.4%, and 0.91±0.lcm, respectively. 2. The effects of year-season-location (station vs. farm) was significant for body weights to 15 months of age, average daily and carcass traits except the retailed cuts. The effect of initial age at the test was significant for body weights at 9 and 15 months, TDN requirements, average daily for 3, 6 and 9 months and backfat thickness, and was not significant for body weight at 18 months, CP requirement, average daily gain for 12 months, dressing percentage, retailed cuts and cutability. The parity effect was significant only for weaning weight. The effect of cattle barns at different places was significant for body weights at 9, 15 and 18 months, average daily gains for 9 and 12 months, and was not significant for TDN requirement, CP requirement, average daily gains for 3 and 6 months and carcass traits.
신언익(O . Y . Shin),김종복(J . B . Kim),한광진(K . J . Han),박영일(Y . I . Park) 한국축산학회 1990 한국축산학회지 Vol.32 No.4
The purpose of this study was to estimate the heritabilities, genetic and phenotypic correlations among certain economic traits on the basis of the data from 490 heads of Korean Native Cattle tested at the Korea Native Cattle Improvment Centre at Seosan, Chungnam Province from August, 1985 to October, 1987. The traits studied were body weights, average daily gain, feed efficiency and carcass traits. The results obtained are as follows. 1. The heritability estimates of the body weights were 0.15±0.033 at birth, 0.20±0.034 at weaning, 0.34± 0.042 at 6 months of age, 0.20±0.035 at 9 months, 0.21 ±0.031 at 12 months, 0.24±0.037 at 15 months and 0.14±0.033 at 18 months of age, respectively. The heritability estimates of the average daily gains for each period of 3, 6, 9 and 12 months after testing were 0.16±0.034, 0.18±0.036, 0.11±0.031 and 0.19±0.035, respectively. 2. The phenotypic correlations among body weights at different ages were positive ranging from .096 to .69.698. The genetic correlations of 12 month weight with body weights at birth, weaning, 6 months and 9 months of age were .649, .276, .751 and .596, respectively. The phenotypic correlations between backfat thickness and body weights after weaning ranged from. .107 to .295. The genetic and phenotypic correlations between dressing percentage and body weights at different ages were low. The phenotypic correlations between retailed cuts and body weights after weaning ranged from -.084 to -.250. The genetic and phenotypic correlations between cutability and body weights at different ages were low. The phenotypic correlations among average daily gains for 3, 4, 5, 6, 7. 8 and 12 months ranged from .382 to .768. The gentic correlations of average daily gains with weaning weight or with 15 month weight were negative, but those with birth weight were positive.
국부가열에 의한 장축 T자형 제품의 특수단조공법의 실험적 및 수치적 연구
김봉수(B. S. Kim),강석순(S. S. Kang),류호연(H. Y. Ryu),한광일(K. I. Han),전만수(M. S. Joun) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In this paper, an experimental and numerical approach was applied to identifying the heat transfer coefficients between the environments inside the furnace and the billet which is partially inside the open type furnace. The heat transfer coefficients are employed for analyzing the heating process and optimizing the consecutive forging process for fabricating T-shape forgings with long stem. A special forging process for manufacturing of spindles is introduced.
신언익(O . Y . Shin),김종복(J . B . Kim),한광진(K . J . Han),박영일(Y . I . Park) 한국축산학회 1990 한국축산학회지 Vol.32 No.4
Selection indexes were derived for the genetic improvement of Korean Native Cattle on the basis of the genetic parameters of economic traits estimated from the data on 490 heads of Korean Native Cattle and the relative econmic weights estimated from the market survey data. The selection index estimated using the four characters, TDN requirements(X₁), average daily gain(X₂), backfat thickness(X₃) and retail cuts(X₄) was: I₁= -X₁+ 33.6 X₂- 2.4 X₃+ 0.75 X₄ and the index estimated using the three characters, average daily gain(X₁), backfat thickness(X₂) and retail cuts(X₃) was: I₁= X₁ -0.018X₂+ 0.035X₃.
젖소의 체세포 지수와 생산형질에 대한 환경효과와 유전모수의 추정
김시동,박영일,최유림,한광진,이일주,정종현,김낙환 한국동물자원과학회 2001 한국축산학회지 Vol.43 No.4
Effects of environmental factors and genetic parameters for somatic cell score(SCS) and production traits were estimated based on 4,722 records of Hostein cows at 113 test farms measured from January, 1994 to June, 1999. Calving year, calving season, cooperative and farm had significant effects on the five traits studied, SCS, milk, fat, protein and SNF(solid not fat) production, except for the farm effect on protein production. The SCS was significantly higher in the cows calving in summer than in other seasons. Milk production was highest in the cows calving in winter and lowest in summer. Heritabilities estimated by multiple trait animal model were 0.03, 0.28, 0.28, 0.30 and 0.29, respectively for SCS, milk, fat, protein and SNF production. Genetic correlations of SCS with milk, fat, protein and SNF production estimated were 0.18, 0.21, 0.25 and 0.22, respectively. Genetic correlations among fat, protein and SNF production were positive and high. Phenotypic correlations of SCS with milk, fat, protein and SNF production estimated were very low.