Schutte J B, Pack M
TNO-Institute of Animal Nutrition and Physiology (ILOB), Wageningen, The Netherlands.
Poult Sci. 1995 Mar;74(3):480-7. doi: 10.3382/ps.0740480.
Two experiments were conducted to evaluate increasing dietary levels of methionine and TSAA on broiler performance and carcass yield. In Experiment 1, the corn-soybean basal diet contained .75% TSAA, to which increasing dose levels of DL-methionine were added, providing at the highest supplemental level .95% TSAA. The experimental diets were fed for 20 d, covering the age period of 14 to 34 d. In Experiment 2, a corn-soybean basal diet containing .70% TSAA was used along with DL-methionine supplements to determine TSAA requirement during the age period of 14 to 38 d. The highest supplemental level of DL-methionine in this experiment provided .94% TSAA. The TSAA requirement was found to be higher for maximum efficiency of feed utilization and breast meat yield than for obtaining maximum weight gain. Based on feed conversion efficiency and breast meat yield, the requirement for TSAA was estimated to be at least .88% for the age period of 14 to 34 or 38 d. It was calculated that the estimated TSAA requirement was equivalent to approximately .75% apparent digestible SAA or .78% true digestible SAA.
进行了两项试验，以评估提高蛋氨酸和总含硫氨基酸（TSAA）的日粮水平对肉鸡生产性能和胴体产量的影响。在试验1中，玉米-豆粕基础日粮含有0.75%的TSAA，并添加递增剂量的DL-蛋氨酸，最高补充水平时TSAA含量为0.95%。试验日粮饲喂20天，涵盖14至34日龄阶段。在试验2中，使用了含有0.70%TSAA的玉米-豆粕基础日粮，并添加DL-蛋氨酸补充剂，以确定14至38日龄阶段的TSAA需求量。该试验中DL-蛋氨酸的最高补充水平提供了0.94%的TSAA。结果发现，为实现饲料利用效率和胸肉产量最大化，TSAA的需求量高于实现最大体重增加时的需求量。基于饲料转化率和胸肉产量，估计14至34或38日龄阶段TSAA的需求量至少为0.88%。经计算，估计的TSAA需求量约相当于0.75%的表观可消化含硫氨基酸（SAA）或0.78%的真可消化SAA。
