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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.
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