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지설하,홍명기,백윤기,유문일 ( S . H . Chi,M . K . Hong,Y . K . Paik,M . I . Yoo ) 한국축산학회 1973 한국축산학회지 Vol.15 No.3
The studies were carried out to find out the effects of different fattening methods when raising on the native grassland with different levels of concentrates was compared with that on improved grassland. The results obtained are as follows: 1. The daily gain per head during the raising period on improved grassland(control group) was 0.948㎏, while that on native grassland without concentrates(treatment 1), with standard amounts of concentrates(treatment 2) and with ad libitum feeding of concentrates(treatment 3) were 0.325㎏, 0.542 and 0.89㎏ each, respectively. 2. The daily gain per head during the fattening period in control group, in treatment 1, in treatment 2 and in treatment 3 were 1.4㎏, 1.7㎏, 1.7㎏ and 1.6㎏ each, respectively, and also showed no significant difference. 3. For the economics, the net income per head in control group, in treatment 1, in treatment 2 and in treatment 3 were 69,856 won (100%), 67.830 won (97%), 64,754 won (93%) and 50,020 won (72%) respectively. The best return among the experimental groups was attained at T1, with 97% of control value actually earned.
코리데일 종면양의 생시 및 이유시체중에 미치는 환경요인의 효과
신원집,염월형,백윤기,지설하,박영일 ( W . J . Shin,W . H . Youm,Y . K . Paik,S . H . Chee,Y . I . Park ) 한국축산학회 1975 한국축산학회지 Vol.17 No.1
The effects of year of birth, age of dam, type of birth, and sex on birth and weaning weights of lambs were estimated by least square method on the basis of the data obtained from 562 lambs raised at the Alpine Experiment Station from the spring of 1964 to the spring of 1974. The birth and weaning weights of lambs from dams at 4 to 7 years of age were heavier than those from younger dams at 2 or 3 years of age. The weights of lambs from older dams at or over 8 years of age were distinctly smaller than those from dams at 4 to 7 years of age. The ram lambs were heavier than the ewe lambs by 0.34㎏ at birth and by 1.32㎏ at weaning. The lambs of single birth were heavier than those of twin lambs by 0.87㎏ at birth and by 2.06㎏ at weaning. The effects of year of birth, age of dam, type of birth, and sex were statistically significant at 1% level for both birth and weaning weights.
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$lt;0.01) on the weight of calves, but effects of the age of dam and parity were not noted.
암모니아 처리가 귀리짚의 일반조성분 및 소화율에 미치는 영향
양창범(C . B . Yang),이희석(H . S . Lee),백윤기(Y . K . Paik) 한국축산학회 1989 한국축산학회지 Vol.31 No.5
Oat straw was treated with 1.5% and 3.0%. anhydrous ammonia of the weight of air dry oat straw in stack, and chemical composition and digestibilities were compared with untreated and anhydrous ammonia treated oat straw. Crude protein content of ammonia treated oat straw was increased 1.3-1.4 fold as compared with untreated oat straw. Neutral detergent fiber (NDF) was decreased significantly (p$lt;0.05) but acid detergent fiber(ADF) and cellulose content were not different from untreated and ammonia treated oat straw. Dry matter, crude protein, crude fiber and NFE digestibility of oat straw were increased significantly by ammonia treatment (p$lt;0.05). And, the ammoniation oat straw significantly improved the DCP and TDN at level 3% especially (p$lt;0.05). The feed intake of the oat straw was significantly increased by ammonia treatment (p $lt;0.05).