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한우 육성빈우 (育成牝牛) 의 에너지와 단백질요구량 추정 1 . 대사시험에 의한 한우 육성빈우의 에너지와 단백질 요구량 결정
정연후(Y . H . Chung),이상철(S . C . Lee),강수원(S . W . Kang),정정수(C . S . Chung),정천용(C . Y . Chung) 한국축산학회 1992 한국축산학회지 Vol.34 No.5
Metabolism trial was carried out to estimate the energy and protein requirements for Korean native heifers. Nine heifer calves weighing about 150㎏ were randomly assigned into three target daily gains (0.2㎏, T₁; 0.6㎏, T₂; 0.8㎏, T₃) with interval of BW 50㎏ through BW 350㎏, aiming to estimate the energy and protein requirements. The amount of nutrient to be fed was based on NRC requirements (1984), and the ration consisted of hay, rice straw and grass silage as roughage source, and concentrate mixture. Average daily gains across body weight classes were 0.30(T₁), 0.62(T₂) and 0.67㎏(T₃), respectively. Except for crude fiber, digestibilities and nutritive values of experimental ration were increased with the increase of daily gain. As expected, nitrogen intake was significantly(P$lt;0.05) increased with the increase of daily gain, but there were no differences in digestible nitrogen intake and nitrogen retention between T₂ and T₃ group. Based on pooled data of body weight classes, nitrogen(N) and digestible nitrogen(DN) requirements were estimated as follows; N requirement(g/W^0.75/day) = 0.98+1.25DG-0.44DG² (R²=0.42**), DN requirement(g/W^0.75/day) = 0.40+1.19DG-0.24DG² (R²=0.49**) Metabolizable energy intake, heat production and energy retention tended to increase with the increase of daily gains, not with body weight, although there was no difference between T₂ and T₃ group. Energy losses expressed as % of gross energy(GE) intake was higest from feces(42.8%), followed by heat production(42.3%), and lowest from urine(2.0%). Total digestible nutrient(TDN), DE and ME requirements were as follows; TDN requirement(g/W^0.75/day) = 28.13+60.40DG-14.03DG² (R²=0.48**), DE requirement(㎉/W^0.75/day) = 134.34+ 220.59DG-71.90DG² (R²=0.54**), ME requirement(㎉/W^0.75/day) = 116.98+171.32DG-35.73DG²(R²=0.54**). Total digestible nutrient, DE and ME requirements for maintenance were 28.13g, 134.3㎉ and 116.98 ㎉/W^0.75/day, respectively. The estimated NEm requirement from the relationship between ME intake and heat production was 76.5㎉/W^0.75/day.
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.
한우 번식우의 월동기 야외사육에 관한 연구 3 . 월동기 사육환경과 영양수준이 육성빈우의 체중변화 및 번식능력에 미치는 영향
강수원(S . W . Kang),정연후(Y . H . Chung),이병석(B . S . Lee),손용석(Y . S . Son),정천용(C . Y . Chung) 한국축산학회 1988 한국축산학회지 Vol.30 No.10
This experiment was carried out to investigate the effects of wintering sites and nutritional levels on the live-weight gains and reproductive performances of Korean Native Growing Heifers during winter season. Thirty six heads of growing heifers were kept at three different wintering sites (housed, outside and woody land) and nutritional levels (100, 125 and 150% of NRC recommendation) for 120 days from Dec. 3, 1984 to Apr. 2, 1985 in Alpine Experiment Station, Daegwallyoung, Korea. The results obtained were summarized as follows; 1. When the growing heifers were wintered at three different wintering sites with three nutritional levels, the live weight of the housed group was more slightly increased than those of others, although, there were not significantly different among them. However, in three nutritional levels, the live weight of the growing heifers fed at 150% level of NRC was significantly higher (P 〈0.01) than that fed at 100% level, but there were not significant differences between 100% and 125%, and between 125% and 150%. 2. Effects of the high nutritional levels on the live weight gain during winter season were not prolonged until the time of ad libitum by grazing, and the live weight gain that was not sufficient at low nutritional level was much more compensated than the high nutritional level during the grazing season. For all three wintering sites, the live weight gains from starting the winter feeding to grazing season were tend to be the same. 3. In the nutrients of feeds in growing heifers, CP efficiency was higher in the housed group and the 100% level than the others, and TDN efficiency was higher in the housed group and the 125% level. Upon this, the live weight gain effect was higher in TDN than CP during winter season. 4. During the winter season, the reasonable feeding level for the growing heifers in the housed feeding was cleared to 107% level of NRC requirement, and the out door feeding was cleared to 120% level of NRC requirement. 5. In reproductive performances, average age and weight at first estrus and estrus cycle of thirty six growing heifers were 13.8 months, 227.3 kg and 21.9 days, respectively, and there were not significantly different among the wintering sites and the nutritional levels.
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.