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강우성(W . S . Kang),탁태영(T . Y . Thak),강태홍(T . H . Kang),정천용(C . Y . Chung) 한국축산학회 1989 한국축산학회지 Vol.31 No.10
To estimate the energy and protein requirements for maintenance of dry Holstein cows, 3 series of experiments on nitrogen and energy balance were conducted. The results obtained were as follow. 1. Nitrogen excreted into urine on 4-5th day of fasting was 405.7㎎/W^0.75, and DCP requirement was 2.5g /W^0.75/day. 2. Net energy, metabolizable energy, digestible energy and TDN requirements for maintenance were 88.3, 116.4, 150.4Kcal and 38.4g per metabolice body size, respectively.
비육시 (肥育時) 한우와 젖소의 단백질과 에너지 요구량 및 그 이용효율
강우성(W . S . Kang),탁태영(T . Y . Thak),강태홍(T . H . Kang) 한국축산학회 1989 한국축산학회지 Vol.31 No.7
This experiment was carried out to determine the efficiency of protein and energy utilizations of fattening Korean Native and Holstein breeds and to compare the efficiency of protein and energy utilizations between two breeds. Eight steers were used for metabolism trials and the experimental periods were divided into 5 stages according to body weights from 250 to 550㎏. The results obtained were as follow: 1. Although energy utilization and daily body weight gain were not different between breeds, the rate of daily body weight gain of Korean Native Cattle(KNC) decreased after 400kg of body weight while Holstein cattle(Hol) decreased after 450㎏ of body weight. 2. The nitrogen retention rate was decreased with fattening stage, and the degrees of change were larger in KNC than HOL. 3. Although the amount of nitrogen consumend was not markedly different, the nitrogen retention rate was higher in KNC than in HOL. 4. HOL seemed to have converted feed to body weight gain more efficiently than KNC by 10%.
홀스타인 수소 육성비육시 사육장소 증체량 및 사료효율에 미치는 영향
정연후,강우성,정천용,김강식,강수원 ( Y . H . Chung,W . S . Kang,C . Y . Chung,K . S . Kim,S . W . Kang ) 한국축산학회 1990 한국축산학회지 Vol.32 No.4
This experiment was carried out to investigate the possibility of outdoor feeding in fattening of Holstein young bull. Ten four-month young bulls were divided into two comparable groups, indoor and outdoor feeding system. The results obtained for 420-day feeding trial are as follows; 1. Daily weight gains of indoor and outdoor feeding group were 1.04 and 1.13kg, respectively. The average daily weight gains from in fall to in spring was higher at the outdoor than at the indoor feeding system. 2. The maximum daily weight gain of indoor and outdoor feeding system was obtained at 369 and 372 days of age, respectively, and daily weight gain at that time was 1.32 and 1.44kg, respectively. 3. Total feed intake was higher at the outdoor than at the indoor feeding system and that in all seasons except in fall was slightly higher at the outdoor than at the indoor feeding system. 4. Feed efficiency per kg-weight gain was decreased by passing the fattening period and that according to feeding sites was slightly better at the outdoor than at the indoor feeding system but there was not significantly different.
생효모 배양물이 젖소 비육우의 성장능력 및 육생산성에 미치는 효과
강우성(W . S . Kang),이상철(S . C . Lee),윤상기(S . K . Yoon),정의수(E . S . Chung),이기종(K . J . Lee) 한국축산학회 1992 한국축산학회지 Vol.34 No.2
The effect of live yeast culture in diets of Holstein dairy bulls was examined in feeding and digestibility trials. Twenty heads weighing about 120㎏ were allocated to control, 0.25% live yeast culture, 0.1% probiotics A and 0.15% probiotics B complex(probiotics+enzyme+yeast culture). In growing period, daily gain was not significantly affected by treatments, but DM intake per ㎏ wt. gain was highest (P$lt;0.05) in live yeast culture group among treatments. For both daily gain and nutrient (DM, CP, TDN) intake per ㎏ wt. gain, live yeast culture group was higher (P$lt;0.05) than control for fattening Ⅰ period, and also was higher (P$lt;0.05) than control and probiotics A group for fattening Ⅱ period. Difference between probiotics A and probiotics B complex was not significant in growth performance for each period. Live yeast culture appeared to shorten the day required to marketing weight compared to other additives. Carcass characteristics except kidney fat were not different among treatments. Profit and net income were improved by 5% and 15% with the inclusion of live yeast culture, respectively. CO₂ and H₂S production through feces were remarkably (P$lt;0.05) affected by the additives. Slight increases in digestibility were observed by the additives for DM, CP and CF.
점토광물질 첨가가 한우 송아지의 발육 및 면역기능에 미치는 영향
조원모,송만강,안병석,김준식,최성복,백봉현,강우성,이수기 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.6
The study was conducted to investigate the effect of dietary supplements of clay additives on the growth performance and immunity in Hanwoo calves. Treatment were composed of control(basal diet) and 3 treatments(basal diet+5% illite, bentonite, and kaolinite). This study was carried out for 90 days with a total of 16 calves from 8 days of age after birth. Basal diet(milk replacer and calf starter) were fed ad libitim during entire experimental period and the results obtained were as follows : 1. Total weight gains throughout the experimental period from 8 days to 90 days of age were 34.88, 36.10, 35.97, and 39.23㎏ for non-supplemented (control), Illite-, Bentonite-, and Kaolinite-supplemented groups, respectively. It tended to be higher in clay mineral-supplemented groups than in control group, however, no statistical significances were found. 2. Average daily intakes of calf starter were 0.66, 0.80, 0.71, and 0.76㎏, and those of hay were 0.11, 0.12, 0.10, and 0.14㎏ for control, Illite-, Bentonite-, and Kaolinite-supplemented groups, respectively. It tended to be higher in clay mineral-supplemented groups than in control group, however, no statistical significances were found. 3. The Proportion of CD2, CD4 as welt as CD8 of T cytotoxic/suppressor cell (19.67% vs 15.27 to 17.10%) was higher in control group than in clay mineral-supplemented groups.