대요크셔종과 랜드레이스종간 상반교잡이 돼지의 복당산자수와 복당체중에 미치는 효과

박영일(Y . I . Park),이수찬(S . C . Lee),김성훈(S . H . Kim) 한국축산학회 1995 한국축산학회지 Vol.37 No.5

The reciprocal crosses between Large Yorkshire and Landrace were compared for the litter size and litter weight on the basis of the data from 4,250 litters of pigs furrowed at the S. Swine Breeding Farm from January, 1986 to June, 1993. The Y×L cross produced by Landrace darns was significantly heavier than the L×Y cross produced by Large Yorkshire dams by 1.61±0.18 ㎏ for the litter weight at birth and by 5.17±0.64 ㎏ for the litter weight at 3 weeks. The Y×L cross had larger litter size at 3 weeks of age by 0.18±0.09 than the L×Y cross, but the difference between the reciprocal cross was statistically insignificant for the litter size at birth. The superiority of Y×L cross over the L×Y cross in the litter weight at birth was significantly reduced in the 9th parity and later as compared to other parities, which reflected the significant interaction between reciprocal crossing arid parity for this trait. The effect to of parity, year of birth and month of birth were also estimated.

한우의 경제형질에 대한 선발지수의 추정

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.

돼지의 번식형질에 대한 교배조합의 효과

김낙환(N . H . Kim),김성훈(S . H . Kim),정영철(Y . C . Jung),박영일(Y . I . Park) 한국축산학회 1992 한국축산학회지 Vol.34 No.3

The data from 3,366 litters of pigs farrowed from November. 1988 to April, 1991 at J Swine Breeding Farm in Icheon, Kyunggi Province were statistically analysed by least squares method to compare the reproductive performance of eight different crosses, D × YL, D × LY, D × DYL. D × DLY, Y × DYL., Y × DLY, Y × L and L × Y. The 3-breed crosses, D × YL and D × LY had the best performance in the number born alive per litter and in the number suckled per litter. Y × DLY, D × YL and D × LY had the largest number born per litter. Of the multiple crosses produced by the 3-breed cross females, D × DYL, Y × DLY and Y × DYL had relatively good performance. The number of stilborn pig per litter was largest in Y × DLY.

돼지의 이유시 체중과 이유시 복부체중에 대한 3 품종 교잡종과 퇴교배종의 (退交配種) 비교

박영일,김종복,진석병 ( Y . I . Park,J . B . Kim,S . B . Jin ) 한국축산학회 1984 한국축산학회지 Vol.26 No.1

The body weights of pig and litter at weaning at 30 days of age were compared between three-breed cross and backcross swine by least squares method on the basis of the data from 2,310 litters of three-breed crosses and 227 litters of backcrosses produced from crossbred Yorkshire-Landrace, Duroc-Yorkshire and Duroc-Landrace dams mated to purebred Duroc, Landrace and Yorkshire boars. The results obtained in this study are as follows. 1. The three-breed crosses, D x YL, L x DY and Y x DL tended to have heavier individual pig weight and litter weight at weaning than the backcrosses. The average superiority of the three-breed crosses over the backcrosses expresses as percentage of the backcross mean was 1.8% for the individual pig weight and 3.0% for the litter weight at weaning. 2. None of the contrasts between sire breeds or between crossbred dam groups was statistically significant for the two traits studied. 3. The results obtained in this study indicate that the use of three-breed cross is preferable to the backcross in order to have heavier pigs and litters at weaning.

우량육용계의 선발을 위한 교잡시험

박영일,백동훈 ( Y . I . Park,D . H . Baik ) 한국축산학회 1973 한국축산학회지 Vol.15 No.4

The purpose of this experiment was to compare the performance of the crosses of seven different stocks to Cornish males for broiler production. The seven stocks used as female parents were White Plymouth Rocks, Columbians, Barred Plymouth Rocks, New Hampshires, Stock D, Stock C, and Stock H. The first four stocks, WR, Columbian, BR, and NH were the pure Strains that had been maintained at the College of Agriculture, Seoul National University. The Stock D was the female parent stock of a broiler stock produced by a Korean Poultry Breeding Farm. The stocks C and D were the commercial chicken of two different broiler stocks imported from abroad. The commercial chicks of the imported Hubbard Broilers were used as the control to compare with the seven different crosses mentioned above. The average body weight at 8 weeks of age was 1,596 grams for the Hubbard Broilers, 1,563 grams for the C×Cornish, and 1,544 grams for the H×Cornish, all of which were significantly larger than those of other stocks compared. The income per bird over the cost of feed and day-old chick was largest for the C×Cornish, followed in rank by the H×Cornish, Hubbard Broilers, D×Cornish, Columbian×Cornish, NH×Cornish, BR×Cornish, and WR×Cornish. The superior performance of the C×Cornish and H×Cornish appeared to be due to the effect of the genes transmitted from their dams. The hens of the Stock C had a higher rate of laying, and had a heavier egg weight than those of the Stock H. The age at 50% production was 196 days for the Stock C, 195 days for the Stock H and 179 days for the Stock D. The average body weight of the hens at 30 weeks of age was about 3.2㎏ for both Stocks C and H.

[동력전단계부문] 하이브리드 차량의 개념설계용 시뮬레이션 프로그램의 개발

전순일(S.I.Jeon),조성태(S.T.Cho),조한상(H.S.Cho),박영일(Y.I.Park),이장무(J.M.Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Because of the oil scarcity and the greenhouse effect in environment. fuel economy and emissions have been received much attention by car-makers. In the above crisis. a hybrid electric car can be one of the resonable solutions<br/> In this paper. we developed the simulation program for laying out the hybrid vehicle. This program consists of the algorithms: to compose hybrid system such as. the power-capacity-matching and the battery-size-selection. to simulate acceleration performance. fuel economy and emissions. to decide PSR(power split ratio). to make shift map. to appraise break-even point of the hybrid vehicle in comparison with I.C. engined vehicle. To test the usefulness of this simulation program. we applied it to a lay-out of the parallel hybrid bus

돼지에 있어 일당증체량과 등지방두께에 대한 선발지수

권오섭,김성훈,정흥우,박영일 ( O . S . Kwon,S . H . Kim,H . W . Chung,Y . I . Park ) 한국축산학회 1986 한국축산학회지 Vol.28 No.10

Selection index for average daily gain and backfat thickness was derived from the genetic and phenotypic parameters estimated on the basis of the data from 3,369 heads of Yorkshires, Durocs, Hampshires and Landraces tested from March, 1984 to August, 1985. The results obtained in this study are summarized as follows; 1. The heritabilities of average daily gain estimated were 0.369, 0.470, 0.318 and 0.367, respectively, in Yorkshires, Durocs, Hampshires and Landraces and the average heritability was 0.381. The heritabilities of backfat thickness estimated were 0.404, 0.662, 0.565 and 0.892, respectively, in Yorkshires, Durocs, Hampshires and Landraces and the average heritability was 0.631. 2. The genetic correlations between average daily gain and backfat thickness were 0.238, 0.425, -0.132 and 0.079, respectively, in Yorkshires, Durocs, Hampshires and Landraces and the average genetic correlation was 0.152. The phenotypic correlations between average daily gain and backfat thickness, were 0.147, 0.321, 0.020 and 0.147, respectively, in Yorkshires, Durocs, Hampshires and Landraces and the average phenotypic correlation was 0.159. 3. The selection index derived from the estimated parameters and economic weights based on the data from market survey on the price of the products was I₁= =X₁+ 6.52X₂ and the index from the economic weights based on the regression analysis of the price of the breeding stocks was I₂= =X₁+ 2.94X₂. (X₁= backfat thickness(㎝), X₂=average daily gain(㎏))

자동화 변속기를 장착한 하이브리드 버스의 변속 특성 해석과 승차감 향상에 관한 연구

조한상(H.S.Jo),조성태(S.T.Jo),박영일(Y.I.Park),이장무(J.M.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2

Detailed mathematical models of hybrid drivetrain components are presented and numerical simulations are carried out to improve the driving comfortability when the system is applied at the vehicle. Theoretical results are compared with experimental ones from the dynamometer as same condition in order to prove the appropriateness of modeling. As vehicle body modeling include suspensions and mounts is added in the hybrid drivetrain modeling, it is possible to predict the dynamic behavior and shift characteristics of hybrid vehicle by driving simulation. These additional results are also compared with a same simulation ones of I.C. engined vehicle equipped manual transmission. All results shows that shift quality of hybrid vehicle is better than that of general one.<br/>

육용계에 있어 계종과 사양수준간의 상호작용에 관한 연구

박영일(Y . I . Park),배규한(G . H . Bae),정흥우(H . W . Chung) 한국축산학회 1987 한국축산학회지 Vol.29 No.6

Five different broiler stocks were compared under two kinds of feeding regimes with different levels of dietary protein and energy to study the interaction between stock and feeding regime. An experimental unit was composed of ten chicks and 6 units were allotted per feeding regime per stock. The traits studied were body weights at 2, 4, 6 and 8 weeks of age, shank length and keel length at 6 and 8 weeks and feed efficiency. viability and income per bird over the cost of day old chick and of feed for the period 0 - 6 weeks and 0 - 8 weeks. The differences among stocks were large and significant for most traits. The differences between the feeding regimes were statistically significant for body weights, keel length and feed efficiency. Males had larger body weights, longer shank and keel, better feed efficiency and higher gross income per bird than females. The interaction between stock and feeding regime was statistically not significant in all traits studied except the feed efficiency for 0-6 weeks and income per bird for 0-8 weeks. The interaction between stock and sex was statistically not significant except the body weights at 6 and 8 seeks. The significant interaction for the body weights appeared to be resulted from a smaller sex difference in certain stock compared with those in other stocks. The interaction between feeding regime and sex was statistically significant for none of the traits studied. The results obtained indicate that the interaction between stock and feeding regime is relatively unimportant for most traits examined in this study.

제주한우에 있어 모색과 체척측정치간의 관계

박영일 ( Y I Park ) 한국축산학회 1972 한국축산학회지 Vol.14 No.2

Certain body measurements of yellowish brown and black cattle were compared to examine if there is any relation between coat color and body measurements in Korean Native Cattle of Cheju Island. The data used were obtained from 145 Cheju Cattle in Cheju Island. The estimates of the difference between yellowish brown and black coat colors (yellowish brown minus black) pooled over the age groups were 1.33±1.23㎝ for chest girth, 0.13±0.88㎝ for withers height, -0.01±0.88㎝ for body length, 0.73±0.66㎝ for chest width, 0.29±0.44㎝ for chest depth, -0.03±0.62㎝ for hip width, and 0.09±0.57㎝ for pin bone width. None of the differences were statistically significant.