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젖소 미경산우용 고수분 완전혼합사료에 있어서 육계분의 밀기울 및 맥강 대체 효과
김창원,곽완섭,원병수 한국동물자원과학회 2001 한국축산학회지 Vol.43 No.3
Eighty Holstein heifers averaging 168 ㎏ were assigned randomly to one of four complete rations containing graded levels of deepstacked broiler litter (0, 15, 30, and 45% on dry matter basis) in order to study effects on animal production and feed economics. High-moisture (40 ∼ 48%) complete rations were formulated to be isoenergetic and were fed for 3 months. Animals were fed in groups without replications. Deepstacked broiler litter (DBL) replaced barley and wheat bran. Feeding DBL did not affect body weight change and average daily gain (ADG). Feed dry matter (DM) intake tended to be high for DBL-fed groups, followed by a tendency of low feed efficiency, compared with those of a control group. Rate of feed cost savings (feed cost/gain) was substantial for DBL-fed groups, compared to that of a control group. No problem with animal health was observed. It was confirmed that dairy heifers may be fed up to 45% of DBL in a high-moisture complete ration.
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.