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채란계 단백질 급원의 단백질과 에너지 이용성의 동시 생물검정
고태송,주양돈,우경목,최철림,박병석 한국가금학회 1994 韓國家禽學會誌 Vol.21 No.2
A study of concurrent bioassay for protein quality and energy level in protein sources was rnade by determining urinary nitrogenous compounds in excreta. The carry over effect of previous feeding was eliminated by 48 h of feeding the experimental diets prior to the determination of for protein digestibility and utilizability, and energy digestibility and metabolizability at 24 h interval during 3 days. Then, protein qualities and energy levels for soybean meal, rapeseed meal and fish meal were calculated by a substitution method. Apparent protein utilization (NB/NI) was affected by the increased fecal nitrogen excretion in soybean meal and by the increased urinary nitrogen excretion in rapeseed meal and fish meal. The apparent metabolizability of energy (ME/GE) was affected by the fecal energy excretion in soybean meal and rapeseed meal and by urinary energy excretion in fishmeal. The results indicated that the concurrent bioassay of protein quality and energy levels in ingredients appears to be applicable to chickens of other age, sex, breeds and environmental conditions.
가금에서 폐쇄형 호흡열량계와 도체분석법으로 측정한 기초대사량의 비교
최철림,고태송,우경목,주양돈,박병석 한국축산학회 1994 한국축산학회지 Vol.36 No.6
The accuracy and linearity of heat production measurements with a closed-circut indirect animal calorimeter (apparatus) assembled in this laboratory were toted. The fasting heat production(basal metabolism) measured with the apparatus was compared with that obtained from the comparative slaughter analysis during a 3 day fasting period with 8, 11, 14, 17, 31, and 41 days-old male broiler chicks fed a commercial complete diet. The apparatus composed of a respiration chamber for animals, an air flow system and an oxygen(O₂) reservoir(spirometer). During operation of the apparatus, 2M NaOH solution absorbed the carbon dioxide (CO₂) produced and the gravimetric CO₂ was weighed as BaCO₃. The volume of water drawn into the reservoir instead of O₂ consumed was converted into the STP volume of the O₂. Daily O₂ consumption(r=0.993, n=5). CO₂ production(r=0.974, n=5) and the basal metabolism per bird determined by the apparatus were linearly correlated with the body weight(BW). Respiratory quotients(RQ) ranged between 0.8 and 0.9. A linear correlation was found between BW and the basal metabolism estimated by both of the apparatus(r=0.994, n=5) or comparative slaughter study(r=0.982, n=6). However, the basal metabolism per metabolic BW (㎏^(0.75)) determined by both respiration apparatus (r=-0.930, n=3) and comparative slaughter study(r=-0.958, n=4) decreased linearly in 8-17 day-old birds, thereafter, stable values were obtained. An average heat production of 118.91㎉/㎏^(0.75) measured by the apparatus was not different significantly from 113. 784㎉/㎏^(0.75) measured by comparative slaugher studies. The results indicates that the basal metabolism determined by the appratus was linear and almost same as that obtained by comparative slaughter studies. This means that the closed-circuit respirometer assembled in this study can be useful for the determination of heat production in small animals. Also endogenous urinary nitrogen (EUn) per basal metabolism (㎎/㎉) was increased with the body weight to 17 days old, but thereafter, the values were equillibriated. This indicated growing broilers did not have paralleled EUn per basal metabolism.
부로일러에서 탈지미강의 가소화에너지 및 대사에너지 함량
고태송(T . S . Koh),조영석(Y . S . Cho),신동신(D . S . Shin),우경목(K . M . Woo) 한국축산학회 1992 한국축산학회지 Vol.34 No.4
Contents of digestible energy (DE), metabolizable energy (ME) and nitrogen-corrected ME (MEn) for a defatted rice bran were determined in day-old male broiler chicks fed basal (control) diet for the first 7 days were fed on the basal diet and diet composed of 70% of basal diet plus 30 % of defatted rice bran (rice bran diet) for the subsequent 14 days as the ratio of replacement for defatted rice bran. The defatted rice bran contained 2.509. 2.465 and 2.321 ㎉ of DE, ME and MEn per gram dry matter, in which 59.2% (DE/GE) of GE was digested, 56.7% (ME/GE) or 54.8% (MEn/GE) was metabolized and 95.8% (ME/DE) or 92.5% (MEn/DE) of DE was utilized. The rice bran diet contained significantly (p$lt;0.05) lower DE, ME and MEn of which DE/GE and ME/GE was decreased significantly (p$lt;0.05) compared with those of basal diet. The rice bran diet decreased (p$lt;0.05) daily gain, feed efficiency (gain/feed) and retentions of protein and lipids though feed intake was not affected. Rice bran diet did not affect excretion of urinary nitrogen per nitrogen intake (UN/Nl) and decreased significantly (p$lt;0.05) digestibility of protein (AN/Nl) and nitrogen balance (NB) per NI (NB/Nl). Also BV of protein (NB/AN or NR/AN) and digestibility of lipids were decreased in birds fed on the rice bran diet. The results indicate that the low energy content of defatted rice bran was due to mainly the decreased digestibility of protein and digestibility of energy in defatted rice bran diet.