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온도 및 일장조건이 소맥의 생육 및 수량에 미치는 영향
조장환,정태영,Cho, C.H.,Chung, T.Y. 한국작물학회 1979 Korean journal of crop science Vol.24 No.2
To observe the effects of temperature and photoperiod on the growth and yield of winter wheat (Triticum aestivum, L) eight varieties including Chang Kwang were tested at various treatments like longday-high temperature (24hrs-20\circ), shortdayhigh temperature (12hrs-20\circ), longday-low temperature (24hrs-14\circ) and shortday-low temperature (12hrs-14\circ). Among the traits measured, days to heading, plant height, spike length, number of spikes per hill and grain yield per hill were generally decreased at high temperature and long day treatment and increased at low temperature and shortday condition. Number of grains per spike was decreased at low temperature and short day condition while increased at longday and high temperature conditions. Grain weight was decreased significantly at high temperature and shortday while increased at low temperature and longday treatment.
부로일러 종계 (種鷄) 숫닭의 사료 섭취량이 단백질 및 에너지 이용에 미치는 영향
고태송(T . S . Koh),원병수(B . S . Won),한성준(S . J . Han),정태영(T . Y . Chung),맹원재(W . J . Maeng) 한국축산학회 1993 한국축산학회지 Vol.35 No.1
To develop methods for simultaneous determination of protein and energy utilizability, interrelationships between diet intake levels and urinary nitrogen (UN), urinary energy (UE), fecal nitrogen (FN) and fecal energy (FE) were investigated in 65 week-old 5.3-6.0 ㎏ of 5 broiler breeder cockerels. True digestibility (TD) and biological value (BV) of protein, net protein utilization (NPU), and true digestible (TDE), biological value (BVE) and bioavailable (BEU) energy utilization were calculated. As diet intake was increased, the excretion of uric acid, ammonia, urea, FN, UN, FE and UE were increased gradually. Ommiting starved bird, the regression of FN (r²=0.998, n=3), UN (r²=0.990, n=3), FE (r²=0.9999, n=3) and UE (r²=0.998, n=3) on diet intake (g/day) was linear. Endogenous urinary nitrogen (EUn) and energy (UEe) estimated by the y-intercepts of regressions were significantly (p$lt;0.05) lower than those in fasted birds although significant difference on metabolic fecal nitrogen (MFn) and energy (FEm) were not found. TD. BV, NPU, TDE, BVE and BEU calculated by the values by regression showed very stable values among levels of feed intake, which were reflected by the stable FN-, UN-, FE- and UE-diet-derived by regression. Also BV and NPU calculated by regression were significantly (p$lt;0.05) lower than those in fasted bird. The results indicated that utilization of protein and energy in diet can be obtained by metabolic fecal and endogenous urinary nitrogen or energy determined simultaneously. Protein and energy utilization determined by regression seems more stabel and more realistic than those determined with fasted birds.
돈분사일리지의 발효성장에 미치는 수분함량 및 당밀대체수준의 영향
정태영(T . Y . Chung),김기철(K . C . Kim),이상락(S . R . Lee),김종민(C . M . Kim),최일(I . Choi),장문백(M . B . Chang),맹원재(W . J . Maeng) 한국축산학회 1993 한국축산학회지 Vol.35 No.5
In view of the effective recycling of animal waste, the fermentation characteristics of swine manure ensiled under various conditions were investigated as the first step to search how to reuse animal waste as feed for animals. The moisture content of swine manure was adjusted to 30, 50 and 70%, respectively and molasses was substituted at the levels of 0, 15 and 30% in each treatment. Small vinyl bags were used as silos for ensiling, and changes of the contents of various organic compounds were measured during the ensiling period of 0, 3, 10 and 30 days, respectively. The temperature for ensiling was constant to be 22℃ for all treatments. The silage pH which is generally used as a criterion to evaluate the fermentation quality of silage was significantly (p$lt;0.001) decreased as levels of moisture and molasses content were increased. In contrast, the content of water soluble carbohydrate was significantly(p$lt;0.01) decreased with higher contents of moisture and molasses. This results may indicate molasses were used as an effective source of energy for the fermentation of swine manure. However, because the values of pH in this study were higher in all treatments than that of the general forage silage, it was presumed that the supply of available energy for microbial growth was a~ot enough in all treatments of this experiment. Furthermore, this inference was supported by the fact that lactic acid was not detected in all treatments so that the fermentation was not progressed up to that of lactic acid formation. More detailed research regarding the sources and levels of available energy for microbial growth may be needed in the future particularly when ensiling swine manure.