Behrends B R, Waibel P E
Poult Sci. 1980 Apr;59(4):849-59. doi: 10.3382/ps.0590849.
Sulfur amino acid requirements of starting, growing, finishing male Large White turkeys were investigated in three experiments using 3000 turkeys. Requirements were determined by least squares analyses of response curves obtained by supplementing methionine and cystine deficient basal diets with graded levels of DL-methionine and/or L-cystine. Experiments were conducted from 1 to 4, 8 to 12, and 16 to 20 weeks of age. Diets included starch, soybean meal, faba beans, and field peas. Requirements for total sulfur amino acids (TSAA) determined with diets marginally deficient in cystine were .95 to 1.01, .70 to .71, and .43 to .48% of the diet for starting (1 to 4 weeks), growing (8 to 12 weeks), finishing (16 to 20 weeks) turkeys, respectively, in different experiments. On the basis of dietary metabolizable energy, the respective TSAA requirement values (in %/therm) were .298 to .332, .205 to .221, and .128 to .134. Minimum methionine requirements (determined with excess dietary cystine) were .46, .30, and .19% of the diet for starting, growing, and finishing turkeys, respectively. Cystine replacement values, calculated by dividing the maximum usable levels of cystine (TSAA requirements minus methionine requirements) by TSAA requirements were 55, 58, and 57% of the TSAA requirement for starting, growing, and finishing turkeys, respectively.
利用3000只雄性大白火鸡，通过三个实验研究了起始期、生长期、育肥期雄性大白火鸡的硫氨基酸需求。需求是通过对响应曲线进行最小二乘法分析来确定的，这些响应曲线是通过用不同水平的DL-蛋氨酸和/或L-胱氨酸补充蛋氨酸和胱氨酸缺乏的基础日粮而获得的。实验在1至4周龄、8至12周龄和16至20周龄进行。日粮包括淀粉、豆粕、蚕豆和豌豆。在不同实验中，用胱氨酸含量略低的日粮测定的起始期（1至4周）、生长期（8至12周）、育肥期（16至20周）火鸡的总硫氨基酸（TSAA）需求量分别为日粮的0.95%至1.01%、0.70%至0.71%和0.43%至0.48%。基于日粮代谢能，相应的TSAA需求值（%/千卡）分别为0.298至0.332、0.205至0.221和0.128至0.134。起始期、生长期和育肥期火鸡的最低蛋氨酸需求量（用过量的日粮胱氨酸测定）分别为日粮的0.46%、0.30%和0.19%。通过将胱氨酸的最大可利用水平（TSAA需求量减去蛋氨酸需求量）除以TSAA需求量计算得出的胱氨酸替代值，起始期、生长期和育肥期火鸡分别为TSAA需求量的55%、58%和57%。
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