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정연후,강우성,정천용,백봉현 한국낙농학회 1981 韓國酪農學會誌 Vol.3 No.2
This experiment was conducted to study the feed value of cow manure fermentation feed (CMFF). Feeding trial was conducted for 147 days with 12 dairy heifers weighting an average of 270 ㎏, and the levels of CMFF in the ration were 0, 25, 50 and 75 % . The results obtaind were as follows ; 1. The chemical composition of CMFF did not change significantly between before and after fermentation. 2. Daily body weight gains of heifers fed 0, 25, 50 and 75% of CMFF were 560, 549, 531 and 507g, respectively. A slight depression of weight gains was observed as the level of CMFF increased but the differences were not significant among treatments. 3. Total feed intake(DM) per head of heifers fed 0, 25. 50 and 75% CMFF were 987.9, 972.2, 960.6 and 963.8㎏, respectively. There was a tendence that the feed intake decreased linearly as the level of CMFF increased. 4. Feed efficiency was depressed as the level of CMFF increased in the rations.
정연후,이상철,김동운,이현정,김진욱,홍성구 한국축산학회 1997 한국축산학회지 Vol.39 No.4
Stromal-vascular(S-V) cells isolated from omental, subcutaneous, intermuscular, and intramuscular adipose tissues of Korean native steers by collagenase digestion were used to evaluate the effects of various hormones on the differentiation in culture. The cells were seeded at a density of 3 × 10⁴ cells/㎠ on the tissue culture plates in M199 medium plus 20% fetal calf serum(FCS) and cultured at 37℃ under a humidified atmosphere of 95% air : 5% CO₂ for about 7 days. After reaching confluence, the cells were treated with DMEM/F12 medium containing 10% FCS and either insulin, triiodothyronine or dexamethasone for induction of adipose differentiation for 2∼4 weeks, and thereafter cellular glycerol-3-phosphate dehydrogenase(GPDH) acitivity was determined as an index of adipocyte differentiation. GPDH activity was about 5 times higher in intermuscular adipose cell cultured in DMEM/F12 medium containing insulin and lipid than in medium containing only insulin, suggesting that lipid plays an important role in development of internmscular triglyceride accumulation. Differentiation in the intermuscular adipose cell was induced by insulin, but the subcutaneous and intramuscular adipose cells did not respond to insulin. Very a few GPDH activity was observed in the omental adipose cell in comparision to the intermuscular adipose cell. Neither triiodothyronine nor dexamethasone were related to adipogenic activity. More GPDH activity was measured in intermuscular adipose cell cultured in insulin plus triiodothyronine(T₃) than in insulin alone, suggesting that T₃ is related to enhance the level of GPDH activity during differentiation and treatment with insulin plus T₃ are responsible for successful adipocyte differentiation in intermuscular adipose cell. The differences in hormone responses of cells derived from different locations of adipose tissue indicated that differences may exist in the regulation of the differentiation of preadipocyte from different locations.
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 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.