Potter L M, Shelton J R
Poult Sci. 1984 May;63(5):987-92. doi: 10.3382/ps.0630987.
Two experiments were conducted using a total of 1,296 poults divided into 144 pens to determine the effects of adding .10% DL-methionine, .10% L-cystine, .50% sodium-sulfate, and .125 or .250% Fermacto -500 to their diets. Large White and Medium White turkeys were raised to 7 and 8 weeks of age in Experiments 1 and 2, respectively. Each of the 24 diets was fed to one pen of each sex in a 2 X 2 X 2 X 3 factorial design in the first experiment and to two pens of each sex in the second experiment. The basal diet, composed primarily of ground yellow corn and dehulled soybean meal, contained 28% protein, .49% methionine, and .41% cystine. Average body weights at the end of the experiments were increased 3.6% from .10% added DL-methionine, 3.4% from .10% added L-cystine, and 5.3 and 6.0% from .125 and .250% added Fermacto -500, respectively. Although sodium sulfate failed to increase final body weights, 2- and 4-week body weights were increased 3.2 and 2.1%, respectively. Sodium sulfate increased body weights more in the absence of added cystine, indicating a sparing effect of sodium sulfate on cystine. The increases in body weight from methionine and cystine were additive, indicating that the sulfur amino acid requirement is probably in excess of 1.10% and that .51% may be cystine.
进行了两项实验，总共使用了1296只小火鸡，将它们分成144个围栏，以确定在其日粮中添加0.10%的DL-蛋氨酸、0.10%的L-胱氨酸、0.50%的硫酸钠以及0.125%或0.250%的Fermacto -500的效果。在实验1和实验2中，大白火鸡和中白火鸡分别饲养到7周龄和8周龄。在第一个实验中，采用2×2×2×3析因设计，将24种日粮中的每一种喂给每种性别的一个围栏；在第二个实验中，喂给每种性别的两个围栏。基础日粮主要由黄玉米粉和去皮豆粕组成，含有28%的蛋白质、0.49%的蛋氨酸和0.41%的胱氨酸。实验结束时，平均体重分别因添加0.10%的DL-蛋氨酸而增加3.6%，因添加0.10%的L-胱氨酸而增加3.4%，因添加0.125%和0.250%的Fermacto -500而分别增加5.3%和6.0%。虽然硫酸钠未能增加最终体重，但2周龄和4周龄时的体重分别增加了3.2%和2.1%。在不添加胱氨酸的情况下，硫酸钠对体重的增加作用更大，这表明硫酸钠对胱氨酸有节约作用。蛋氨酸和胱氨酸导致的体重增加具有累加性，这表明含硫氨基酸的需求量可能超过1.10%，其中0.51%可能是胱氨酸。
