Waldroup P W, England J A, Waldroup A L, Anthony N B
Poultry Science Department, University of Arkansas, Fayetteville 72701, USA.
Poult Sci. 1997 Nov;76(11):1543-55. doi: 10.1093/ps/76.11.1543.
A study was conducted to evaluate the amino acid recommendations of the NRC (1994) when diets were changed at 3- or 4-wk intervals. Diets formulated to provide from 90 to 115% of recommended amino acid levels were fed to Nicholas (NIC) and British United Turkey (BUT) Large White males from day-old to 24 wk of age; samples of turkeys were processed at 18 and 24 wk. Results indicated that the amino acid levels suggested by NRC are adequate to support maximum body weight gain, feed conversion, and dressing percentage of Large White males grown to 18 or 24 wk when fed on 4-wk intervals. An approximately 5% higher level of amino acids was required to maximize breast yield. When feeds were changed at 3-wk intervals, higher levels of amino acids were required to maximize performance; however, there did not seem to be any difference in the response of the two strains of turkeys to different levels of amino acids in this study.
进行了一项研究，以评估美国国家研究委员会（1994）的氨基酸推荐量，即在每隔3周或4周更换日粮时的情况。为尼古拉斯（NIC）和英国联合火鸡（BUT）大白公火鸡配制了提供推荐氨基酸水平90%至115%的日粮，从雏鸡期到24周龄饲喂；在18周和24周时对火鸡样本进行处理。结果表明，美国国家研究委员会建议的氨基酸水平足以支持大白公火鸡在以4周为间隔饲喂至18周或24周时的最大体重增加、饲料转化率和屠宰率。要使胸肉产量最大化，所需氨基酸水平大约要高5%。当每隔3周更换一次饲料时，需要更高水平的氨基酸才能使生产性能最大化；然而，在本研究中，这两个品系的火鸡对不同水平氨基酸的反应似乎没有任何差异。
