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Brahman 과 Santa Gertrudis 의 유전형질을 이용한 제주한우 개량에 관한 연구 2 . 이유후 성장에 미치는 품종 및 환경요인 효과
김동철(D . C . Kim),김중계(J . K . Kim),이희석(H . S . Lee),백윤기(Y . K . Paik) 한국축산학회 1987 한국축산학회지 Vol.29 No.6
The primary objective of this breeding project was to study methods for improvement of economically important traits of Cheju Native Cattle with Brahman and Santa Gertrudis that are adaptable to specific climatic conditions, poor quality forage and to make use of some other genetic merits. Date obtained from 428 calves (59 Cheju Native Cattle, 60 Brahman, 40 Santa Gertrudis and 269 crossbreds) were analyzed to estimate main effects of environmental factors on postweaning periods. The results of this study are summarized as follows; 1. The average body weights of Cheju Native Cattle at 12 months (101.8 ㎏) and at 18 months (179.3 Kg) were lightest among the purebreds, and average body weights of Brahman at 12 months and 18 months of age were 196.9 ㎏ and 253.3 ㎏, respectively, which were heavier than those of the Santa Gertrudis (188.8 ㎏ and 234.7 ㎏, at the same age). 2. The average body weights of BK (Brahman × Cheju Native Cattle) and SK (Santa Gertrudis × Cheju Native Cattle) were lighter than any other crossbreds observed. The back crossbred, B2K (BK × Brahman) and S2K (SK × Santa G.), grew faster and were hoavier at 12 months (B2K; 193.4 ㎏, SK; 183.4 ㎏) than the crossbred × back crossbreds (BK × B2K and SK × S2K), which were 182.4 ㎏ and 182.5 ㎏, respectively. The average body weight of BK × B2K at 18 months was 241.7 ㎏, which was considerably higher than those of B2K (238.8 ㎏) and SK × S2K (229.2 ㎏). which were similar to those of S2K (230.2 ㎏) (PG0.07. ). 3. Sex and year of birth had a highly significant effect (P$lt;0.01) on the weight of calves, but effects of the age of dam and parity were not noted.
육성우에 대한 이조대맥 whole barley crop silage 이용에 관한 연구
이희석,김동철,백윤기,정창기,정재준 ( H . S . Lee,D . C . Kim,Y . K . Beak,C . C . Choung,J . J . Choung ) 한국축산학회 1984 한국축산학회지 Vol.26 No.4
A study was conducted to evaluate the feed value of whole barley silage made at different stages, of growth. Twelve growing cattle were fed rations consisting of Italian ryegrass silage (T₁), milk stage whole barley silage (T₂) and whole barley silage at the ripening stage (T₃) far a period of 90 days. Results obtained from feeding trials were: 1. Crude protein content of silages were T₁; 2.69%, T₂; 3.99% and T₃; 5.0%. Total organic acid content of silages were 3.43 (T₁), 2.54% (T₂) and 5.44% (T₃). Showing the superior quality of silage made from whole barley at the ripening stage. 2. Daily dry matter intake of silage were T₁ ; 2.26㎏, T₂ ; 3.89㎏ and 4.29㎏ in T₃. The highest daily weight gain was found in T₃ (0.83㎏/head/day) following by T₂ (0.7㎏/head/day) and was lowest in T₁ (0.69㎏/head/day). 3. A linear curve regression equation between daily weight gain and silage intake showed T₁ : Y=1.36-0.03X +3.04X² R=0.773**, T₂; Y=2.175 + 1.714X+0.143X² R=0.567 and T₃; Y=3.778 - 3.71X + 5.323X² R-0.887**.
이희석(H.S.Lee),배동호(D.H.Bae) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
For the purpose of establishing laser welding condition(welding speed, laser power and beam focus) for four kinds of materials ; SPC, SK5M stainless steel(SUS304), and Al-alloy 5052 using in the thin plate structure such as automobile, train and so on, their laser weldability and static tensile strength were evaluated. Especially, high carbon steel sheet SK5M needs heat treatment after laser welding for obtaining higher strength and ductility of the welded joint Obtained available laser welding condition for each sheet are as following table.<br/>
대두박내 트립신억제제의 함량이 칠면조의 성장과 아미노산이용율에 미치는 효과
이희석(H . S . Lee),한인규(I . K . Han),최윤재(Y . J . Choi),윤철희(C . H . Yun) 한국축산학회 1991 한국축산학회지 Vol.33 No.11
The objective was to determine the relationships among the levels of soybean trypsin inhibitor activity (TI), pancreatic hypertrophy, body weight gain. and the amino acid digestibility in turkey poults. Two commercially custom-prepared soybean meals were blended to produce six diets with a range of TI from 2.9 to 6.0 ㎎/㎏ of diet. Body weight gains were 459, 453, 462, 450, 458 and 432g; pancreas weights 1.74, 1.84, 1.97, 2.14, 2.38 and 2.33g; metabolizable energy values 3,440, 3,468, 3,481, 3,437, 3,422 and 3.474 ㎉/㎏ dry matter of diet; the mean values of amino acid digestibility by ileal contents 83.2, 86.1, 83.5, 84.2, 83.9 and 84.1%; average amino acid digestibility by fecal excreta 86.5, 86.9, 85.3, 86.0, 86.2 and 86.3%. Although body weight gain was significantly reduced by the highest level of TI and pancreas weight was significantly increased by three highest levels of TI, the metabolizable energy values of the diets, and amino acid digestibilities by using ilea] contents and fecal excreta were not different.
제주한우 개량에 관한 연구 1 . 제주한우 , Brahman , Santa Gertrudis 및 교잡종의 번식상황에 관한 통계학적 연구
김동철,이희석,백윤기,김중계 ( D . C . Kim,H . S . Lee,Y . K . Baek,J . K . Kim ) 한국축산학회 1982 한국축산학회지 Vol.24 No.6
The objectives of this study were to determine by experimental results the age at first calving, gestation length and calving interval of Jeju native, Brahman, Santa Gertrudis and crossbreeds. Data were analysed by the least square method, from 582 cows fed at Jeju Experiment Station from 1961-1980. 1. The average age at first calving of Jeju native, Brahman and Santa Gertrudis was 41.9, 42.8 and 39.8 months respectively. The average age at first calving of Brahman × Jeju native and Santa Gertrudis was 39.1 and 42.1 months. 2. The average gestation length of Jeju native, Brahman and Santa Gertrudis was 285.9, 286.2 and 284.7 days respectively. The average crossbreeds gestation length, however, was longer than their parents with an increase of 1% in Brahman × Jeju native and 4% with Santa Gertrudis × Jeju native cattle. 3. The average calving interval of Jeju native, Brahman and Santa Gertrudis was 384.7, 465.9 and 501 days. Crossbreeds, however, have shorter calving intervals than their parents with an increase of 5.3% in the case of Brahman × Jeju native and 6.4% with Santa Gertrudis × Jeju native cattle (P$lt;0.01). 4. Gestation length was longest when dam was 8-9 years old (P$lt;0.05) but calving interval declined as parity increased.