Six experiments were conducted to validate the hypothesis that Lys and SAA requirements decrease within the starter phase using 3-d periods from 2 to 11 d of age. In the first 3 experiments, 7 diets were generated by adding L-Lys to a lysine-deficient basal diet in 0.10% increments, ranging from 0.85 to 1.45% digestible Lys. In experiments 4 to 6, and 7 diets were generated by adding 0.07% increments of DL-methionine to a SAA-deficient diet to produce diets ranging from 0.63 to 1.04% DSAA. The linear broken line estimate for digestible Lys was 1.22, 1.17, and 1.16% for BWG and 1.31, 1.21, and 1.14% for FCR in experiments 1, 2, and 3, respectively. The linear broken line estimate for DSAA was 0.82, 0.81, and 0.94% for BWG and 0.82, 0.80, and 0.90 for FCR in experiments 4, 5, and 6, respectively. These results indicated that Lys requirements decreased linearly as hypothesized, however, the SAA requirements did not follow same pattern.

进行了 6 次实验，以验证 Lys 和 SAA 需求在 2 至 11 日龄的 3 日期间在起始阶段内减少的假设。在前 3 个实验中，通过将 L-Lys 以 0.10% 的增量添加到缺乏赖氨酸的基础日粮中，产生了 7 种日粮，可消化赖氨酸的范围为 0.85% 至 1.45%。在实验 4 至 6 和 7 日粮中，通过在缺乏 SAA 的日粮中添加 0.07% 的 DL-蛋氨酸以产生 0.63% 至 1.04% DSAA 的日粮。在实验 1、2 和 3 中，可消化 Lys 的线性折线估计值分别为 BWG 的 1.22、1.17 和 1.16% 以及 FCR 的 1.31、1.21 和 1.14%。在实验 4、5 和 6 中，DSAA 的线性折线估计值分别为 BWG 的 0.82、0.81 和 0.94%，以及 FCR 的 0.82、0.80 和 0.90。