Murillo M G, Jensen L S
Poult Sci. 1976 Jul;55(4):1414-7. doi: 10.3382/ps.0551414.
Two experiments were conducted with Large White male turkeys from 8-12 weeks of age to estimate the methionine requirement for optimum growth rate and feed efficiency. The first experiment was conducted with five pens of 22 turkeys per treatment when the mean minimum temperature was 17.2 C and the maximum 32.2 C. The second experiment was conducted with four groups of 14 turkeys per pen when the mean minimum temperature was 1.4 C and the maximum 12.4 C. Initial body weight and rate of gain in the first experiment was lower than that in Experiment 2. Maximum growth and feed efficiency in Experiment 1 were obtained with a methionine level between 1.32 and 1.41 g./mcal. of M.E. and in Experiment 2 between 1.27 and 1.43 g. Adding 0.1% l-cystine to the basal diet in Experiment 2 failed to improve growth or feed efficiency significantly. The estimated requirement for methionine in these experiments agrees with the present estimate of the National Research Council.
用8至12周龄的大白公火鸡进行了两项试验，以估计获得最佳生长速度和饲料效率所需的蛋氨酸量。第一项试验在平均最低温度为17.2摄氏度、最高温度为32.2摄氏度时进行，每个处理设5个栏，每栏22只火鸡。第二项试验在平均最低温度为1.4摄氏度、最高温度为12.4摄氏度时进行，每组设4个栏，每栏14只火鸡。第一项试验的初始体重和增重率低于试验2。试验1中，蛋氨酸水平在每兆卡代谢能1.32至1.41克时可获得最大生长速度和饲料效率，试验2中该水平为1.27至1.43克。在试验2的基础日粮中添加0.1%的L-胱氨酸未能显著提高生长速度或饲料效率。这些试验中估计的蛋氨酸需求量与美国国家研究委员会目前的估计一致。
