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한우와 샤로레교잡에 의한 신종한우육성 연구 1 . 농가사육상태하에서의 한우와 샤로레교잡종의 발육및 번식능력 비교
나기준,이근상,김희석,김강식 ( K . J . Na,K . S . Lee,H . S . Kim,K . S . Kim ) 한국축산학회 1985 한국축산학회지 Vol.27 No.4
This experiment was carried out to compare the growth rates and reproductive traits between Korean native cattle and Charolais crossbreeds. The results obtained were summarized as follows: The body weight of Charolais crossbreed (CK) was 41, 39, 44, 29% heavier at the age of 3, 6, 12 and 18 months than that of Korean native cattle(K) on the farm performance and was 26, 47, 58, 51% heavier on the station performance test(S.P.T). In the Charolais back-crossbreed (CCK) was S5, 44, 46, 40% heavier on the farm performance and 50, 49, 69, 55% on S.P.T. Body measurement of the crossbreeds was taller, wider and longer than that of K. Age and body weight at puberty of the crossbreeds was earlier and heavier than that of K. The type of parturition of Charolais crossbreeds was 92.6% in normal and 7.4% in abnormal in CK, and 94%, 6,0% in CCK, respectively.
Charolais 종 유전형질도입이 한우및 Charolais 교잡종들의 체중과 체형에 미치는 영향
나기준,이근상,오선균,김내수 ( K . J . Na,K . S . Lee,S . K . Oh,N . S . Kim ) 한국축산학회 1986 한국축산학회지 Vol.28 No.11
This experiment was carried out to develop the new synthetic breed (5/8 Charolais 3/8 Hanwoo with the importation of Charolais traits to Hanwoo. The mating and environmental effects on the body weights and body measurements of Hanwoo (K), Charolais first crossbred (F₁), Charolais backcross (B₁) and synthetic breed (S) at 3, 6, 12, 18 and 36 months of age on farm feeding from 1979 to 1985 were estimated by least squares method. The results obtained were summarized as follows; 1. The mating system showed a highly significant effect on body weights and body measurements of K, F₁, B₁ and S. The average body weights and standard errors of K, F₁, B₁ and S were 84.0±3.28㎏, 119.6±1.48㎏, 124.0±2.41㎏ and 116.1±3.60㎏ at 3 months, 147.1±4.00㎏, 195.4±1.91㎏, 201.7±3.61㎏ and 186.2±5.61㎏ at 6 months, 270.8±4.87㎏, 354.8±3.09㎏, 357.0±5.68㎏ and 322.7±11.16㎏ at 12 months, 379.3±5.64㎏, 468.8±4.57㎏ and 477.3±9.04㎏ at 18 months, 448.1±11.04㎏, 513.4±10.23㎏ and 501.4±17.99㎏ at 36 months of age. The Charolais crossbreds were weighed 38-42%, 27-37%, 19-32%, 24-26% and 12-15%. heavier in body weights and also greater in body measurements than those of Hanwoo at 3, 6, 12, 18 and 36 months of age (P$lt;0.01). 2. The effect of calving years had a significant on both traits. Even though the values of body weights and measurements of the calves calved at summer period were greater than those of other seasons, the effect was not significant among months of age. The sex effect on the body weights and body measurements had a significant effect except 3 months of age.
한우와 샤로레교잡에 의한 신종한우육성 연구 2 . 사양형태별 한우와 샤로레 1 대잡종 발육과 번식능력 비교
이근상,나기준,김희석,윤철준 ( K . S . Lee,K . J . Na,H . S . Kim,C . J . Yun ) 한국축산학회 1985 한국축산학회지 Vol.27 No.4
This study was carried out to investigate the growth rate, the age and body weight at puberty during the growing period in Korean native cattle (K) and Charolais crossbreed (CK). 14 Korean native bulls or heifers and 14 CK were alloted to two nutritional levels (Standard level and Low level groups based on the NRC) during the experimental period. The growth rate of CK was 28%-55% faster n bulls and 33%-26% in heifers than that of K (P$lt;0.01). The feed efficiency of CK was 6%-10% less in bulls and 12%-8% in heifers than that of K. The dressing percent was 60.5-61.9% in CK and 56.7-59.9% in K. The age at puberty was different between regimes (P$lt;0.05) and the average body weight at puberty was the same between breeds (P$lt;0.05).
한우와 Charolais 교잡종의 체중과 체위간의 표현형 상관추정 연구
나기준(K . J . Na),이근상(K . S . Lee),오선균(S . K . Oh),김내수(N . S . Kim) 한국축산학회 1987 한국축산학회지 Vol.29 No.8
This experiment was carried out to develop the new synthetic breed (5/8 Charolais 3/8 Korean native cattle) with the importation of Charolais traits to Korean native cattle from 1979 to 1985. The phenotypic correlations between body weights and measurements of Korean native cattle (K), Charolais first crossbreed (F₁), Charolais back crossbreed (F₂) and Synthetic breed (S) at 3 and 12 months of age were estimated. The results obtained were summarized as follows 1. The phenotypic correlation coefficients of each breed between body weights and measurements were positive. 2. The chest girth was the most highly correlated with body weights in each breed. 3. The ranges of correlation coefficients between body weights and chest girth of K, F₁, B₁ and S at 3 and 12 months of age were 0.673-0.894, 0.72a-0.936, 0.472-0.897 and 0.601-0.921, respectively.
한우와 Charolais 교잡종의 체중에 대한 상가적 및 잡종강세효과의 추정
나기준(K . J . Na),전광주(G . J . Jeon),김형철(H . C . Kim),조병대(B . D . Cho),이근상(K . S . Lee) 한국축산학회 1995 한국축산학회지 Vol.37 No.2
The additive and heterosis effects on body weights between Hanwoo(Korean cattle) and crossbreeds from Charolais x Hanwoo were estimated. The data were recorded from 1979 to 1991 in Kangwha area and were analysed by using linear regression models. The estimated least squares means on body weights of Hanwoo were 85.4±4.6 ㎏ at 3 months of age. 150.2±6.9 ㎏ at 6 months of age and 258.5±11.4 ㎏ at 12 months of age, respectively. The body weights of the crossbreeds ranged from 117.1 to 126.3㎏ at 3 months of age, from 192.0 to 216.8 ㎏ at 6 months of age, and from 352.6 to 383.4 ㎏ at 12 months of age, respectively. The additive effects on body weight were 45.59±6.37 ㎏ at 3 months of age, 78.75±10.13 ㎏ at 6 months of age and 136.27±17.69 ㎏ at 12 months of age. The effects of heterosis were 7.65±3.89 ㎏ at 3 months of age, 21.35±6.09 ㎏ at 6 months of age and 47.47±10.92 ㎏ at 12 months of age, respectively.
유전적 개량 극대화를 위한 유우 및 육우의 이상적인 후대검정두수
전광주(G . J . Jeon),김형철(H . C . Kim),나기준(K . J . Na),조병대(B . D . Cho) 한국축산학회 1995 한국축산학회지 Vol.37 No.3
Optimum number of progeny for given capacities of progeny test size was examined by deterministic models using various levels of heritabilities and population sizes. The theoretical maximum genetic improvement is possible by maximizing the function of selection accuracy, selection intensity, and genetic variation of the traits of interest. To estimate the optimal progeny test breeding schemes. The elements in the function of genetic response are interrelated. And thus, the algorithm used in this study was that the implicit equation was solved iteratively. The results suggested that for an economic trait with heritability of 0.3, given the size of progeny test station with 3,000 breeding females and 33 proven sires to be selected annually, the optimum number of young bulls to be progeny tested was 100 and the number of progeny per bull was 10.
한우와 육우교잡종에 대한 산육 및 사료이용성에 관한 연구
홍성구(S . K . Hong),나기준(K . J . Na),이근상(K . S . Lee),김내수(N . S . Kim),이택원(T . W . Lee) 한국축산학회 1988 한국축산학회지 Vol.30 No.1
This study was carried out to investigate the growth rate, feed efficiency and carcass traits of Korean native cattle (KK), and it`s crossbreedsive Simmental carssbreed (SK), Brown Swiss crossbreed (BK) and Japanese brown crossbreed (JK) at livestock experiment station from 1979 to 1986. The effects of the mating system, year of birth and season of birth on the body weights at 6, 9, 12, 15 and 18 months of age, on the nutrient intakes at the different months of age and on the carcass traits were estimated by least squares method. Breed groups were consisted of 12 calves; of KK, 6 calves of SK, 8 calves of BK and 5 calves of JK. 1. Growth capacity The average body weights of KK, SK BK and JK were 97.1±16.4㎏, 182.8±11.5㎏, 191.8±14.0㎏ and 127.9±15.4㎏ at 6 months (P$lt;0.05), 169.0±20.9㎏, 289.4±14.7㎏, 277.7±17.8㎏ and 223.8±19.6㎏ at 9 months, 242.7±29.7㎏, 424.7±20.9㎏, 386.3±25.3㎏ and 329.4±27.9㎏ at 12 months, 343.0±31.7㎏, 527.3±22.3㎏, 495.0±27.1㎏ and 410.8±29.8㎏ at 15 months, 421.6±32.9㎏, 625.7±23.1㎏, 573.3±28.1㎏ and 497.4±31.0㎏ at 18 months of age, respectively (P$lt;0.01). The average daily gains of KK, SK, BK and JK were 0.90±0.06㎏, 1.23±.004㎏, 1.06±0.05㎏ and 1.03±0.06㎏, respectively (P$lt;0.01). 2. Feed efficiency D.M. requirements per ㎏ gain of KK, SK, BK and JK were 6.48±0.30㎏, 6.50±0.25㎏, 7.52±0.30㎏ and 6.43±0.33㎏, respectively (P$lt;0.05). The average amounts of C.P, requirement per ㎏ gain of KK, SK, BK and JK were 1.03±0.05㎏, 1.06±0.04㎏, 1.23±0.05㎏ and 1.00±0.05{{ }}㎏, respectively (P$lt;0.05). 3. Carcass traits The average carcass percentages of KK, SK, BK and JK were 60.1±1.3%, 62.2±1.0%, 61.4±1.2% and 60.6±1.2%, and the average lean meat percentages of KK, SK, BK and JK were 44.3±1.2%, 46.4±0.9%, 43.3±1.1% and 43.4±1.0%, respectively. There were no significant differences among breed groups in carcass and lean meat percentage.
생체에서 초음파 측정기를 이용한 한우 도체형질의 추정에 관한 연구
김형철(H . C . Kim),전광주(G . J . Jeon),나기준(K . J . Na),유영모(Y . M . Yoo),정재경(J . K . Chung) 한국축산학회 1995 한국축산학회지 Vol.37 No.4
The carcass traits in live Hanwoo were estimated using the ultrasonic color scanning scope. A total number of 229 bull and steer records were measured. The data were collected for two years from 1992 to 1993. `Ihe estimates of backfat thickness using ultrasonic measurement from live animals for bulls and steers were 0.5㎝ and 0.91㎝, respectively, and those of slaughter measurement were 0.48㎝ and 0.91㎝, correspondingly. And also, the similar results were found for eye muscle area(EMA). The blue dot percentage indicating the marbling score tended to increase from 18 month of age to 21 month of age. The prediction equation using the linear regression were highly accurate for meat quantity(R²=0.91 to 0.93) but was less accurate for meat quality(R²=0.4).