Sell J L, Jeffrey M J, Kerr B J
Department of Animal Science, Iowa State University, Ames 50011.
Poult Sci. 1994 Dec;73(12):1867-80. doi: 10.3382/ps.0731867.
An experiment was conducted to determine the influence of essential amino acid (EAA) supplementation of low-protein diets and of MEn feeding sequence on performance and selected carcass characteristics of turkey toms. Feeding diets containing 93 or 100% of the protein and 100% of the EAA concentrations recommended by NRC (1984) or a diet containing 93 and 107% of the recommended protein and EAA concentrations, respectively, had no effect on BW or feed efficiency of toms at 104 or 117 d of age. Dietary protein-EAA concentrations also had no effect on carcass and breast meat yields or proximate composition of carcasses at 105, 112, or 118 d of age, irrespective of MEn feeding sequence. Feeding diets supplying 108% of the MEn concentrations (MH) listed by NRC from 41 to 104 d improved BW (P < .02) and feed efficiency (P < .01) as compared with feeding 102% (M) of the MEn listed by NRC, but only the improvement in feed efficiency was evident at 117 d. Feeding diets supplying 108% MEn from 41 to 104 d, followed by the 102% MEn diet from 104 to 117 d (MHM), resulted in the same 117-d BW and feed efficiency as feeding the MH MEn sequence from 41 to 117 d. Metabolizable energy feeding sequence had no consistent effect on carcass or breast meat yields. Feeding the MHM sequence decreased (P < .05) fat pad and carcass fat of toms processed at 105, 112, and 118 d, compared with the MH feeding sequence. However, fat pad and carcass fat of toms fed the MHM MEn sequence generally exceeded those of toms fed M MEn diets from 1 d to time of processing.
进行了一项试验，以确定低蛋白日粮补充必需氨基酸（EAA）以及代谢能（MEn）饲喂顺序对火鸡公雏生产性能和部分胴体特性的影响。饲喂含NRC（1984）推荐蛋白质浓度93%或100%以及EAA浓度100%的日粮，或分别含推荐蛋白质和EAA浓度93%和107%的日粮，对104日龄或117日龄火鸡公雏的体重（BW）或饲料效率没有影响。日粮蛋白质-EAA浓度对105、112或118日龄火鸡的胴体和胸肉产量或胴体的近似组成也没有影响，无论MEn饲喂顺序如何。与饲喂NRC列出的MEn浓度102%（M）的日粮相比，从41日龄至104日龄饲喂NRC列出的MEn浓度108%（MH）的日粮可提高BW（P < 0.02）和饲料效率（P < 0.01），但仅在117日龄时饲料效率的提高才明显。从41日龄至104日龄饲喂108% MEn的日粮，然后从104日龄至117日龄饲喂102% MEn的日粮（MHM），其117日龄的BW和饲料效率与从41日龄至117日龄饲喂MH MEn顺序的相同。代谢能饲喂顺序对胴体或胸肉产量没有一致的影响。与MH饲喂顺序相比，饲喂MHM顺序可降低105、112和118日龄屠宰火鸡公雏的脂肪垫和胴体脂肪（P < 0.05）。然而，从1日龄至屠宰时，饲喂MHM MEn顺序的火鸡公雏的脂肪垫和胴体脂肪通常超过饲喂M MEn日粮的火鸡公雏。
