Waldroup P W, England J A, Kidd M T, Kerr B J
Poultry Science Department, University of Arkansas, Fayetteville 72701, USA.
Poult Sci. 1998 Sep;77(9):1364-70. doi: 10.1093/ps/77.9.1364.
A study was conducted utilizing two strains of male Large White turkeys (BUT Big 6 and Nicholas 700) to determine the effects of increasing Arg:Lys ratios on live performance and carcass composition. Diets were formulated to provide 100, 110, and 120% of NRC (1994) Lys levels, adjusted for dietary energy level, with Arg:Lys ratios of 1.0:1, 1.1:1, 1.2:1, and 1.3:1 in a 3 x 4 factorial arrangement. Eight pens of 15 poults (four pens of each strain) were fed each of the 12 test diets for an 18-wk period. Diets were changed at 3-wk intervals rather than the 4-wk interval suggested by NRC. The results of this study suggest that the Arg and Lys levels suggested by the NRC (1994) are not sufficient when diets are fed on 3-wk intervals, rather than the 4-wk intervals suggested by NRC. This conclusion is in agreement with the studies of Waldroup et al. (1997b). Increasing Arg:Lys ratios improved performance of turkeys only when the diets contained insufficient amounts of Arg in association with low levels of Lys. Increasing Arg:Lys ratios when diets contained sufficient amounts of these two amino acids was without benefit, in contrast to the report of Brake et al. (1994). Turkeys of the BUT Big 6 strain appeared to be more sensitive to marginal deficiencies of Lys and Arg than did turkeys of Nicholas 700 strain.
利用两株雄性大白火鸡（BUT Big 6和Nicholas 700）进行了一项研究，以确定提高精氨酸与赖氨酸比例对生长性能和胴体组成的影响。根据日粮能量水平调整日粮配方，使其提供NRC（1994）赖氨酸水平的100%、110%和120%，精氨酸与赖氨酸比例分别为1.0:1、1.1:1、1.2:1和1.3:1，采用3×4析因设计。12种试验日粮每种饲喂8个圈舍，每个圈舍15只雏鸡（每个品系4个圈舍），为期18周。日粮每隔3周更换一次，而不是按照NRC建议的4周间隔。本研究结果表明，当日粮每隔3周饲喂一次而非按照NRC建议的4周间隔时，NRC（1994）建议的精氨酸和赖氨酸水平是不够的。这一结论与Waldroup等人（1997b）的研究一致。仅当日粮中精氨酸含量不足且赖氨酸水平较低时，提高精氨酸与赖氨酸比例才能改善火鸡的生长性能。与Brake等人（1994）的报告相反，当日粮中这两种氨基酸含量充足时，提高精氨酸与赖氨酸比例并无益处。BUT Big 6品系的火鸡似乎比Nicholas 700品系的火鸡对赖氨酸和精氨酸的边缘性缺乏更为敏感。
