Smartamine ML (Adisseo), a bioavailable (80%) source of lysine and methionine was used to evaluate effects of increasing lysine supply on performance of beef cattle. Crossbred steers (n=120, initial BW 261 kg) were individually fed a diet of 15% modified distillers grains plus solubles (MDGS), 68% blend of high moisture and dried rolled corn, 12% corn silage, and 5% supplement with Smartamine ML top-dressed daily. Steers were assigned to 8 inclusions of lysine, 0 to 7 g/d in 1 g increments, with 15 steers per treatment. Data were analyzed with MIXED procedure of SAS as a generalized randomized design with animal as experimental unit and treatment as fixed effect. Orthogonal contrasts evaluated linear, quadratic, and cubic responses. Contrast statements compared the control with 1, 2, and 3 g/d treatments. Feeding increasing amounts of bioavailable lysine linearly decreased DMI (P = 0.04), final live BW (P = 0.04), and ADG (P = 0.02) with no effect on G:F (P ≥ 0.27). Numerical differences in DMI and ADG (P ≥ 0.26) led to a trend (P = 0.06) for improved live G:F for the 1 g/d treatment compared with control (0.188 and 0.176, respectively). During the Optaflexx feeding period (d 163-195), DMI linearly decreased (P = 0.01) as lysine increased in the diet with no differences in ADG (P ≥ 0.13) or G:F (P ≥ 0.12), with a trend (P = 0.08) for improved live G:F for 3 g/d compared with control (0.163 and 0.131, respectively). Hot carcass weight tended (P = 0.07) to linearly decrease as Smartamine ML increased in the diet, with no effect on other carcass measures including longissimus muscle area, 12th rib fat, and marbling score (P ≥ 0.18). In finishing beef cattle diets with 15% MDGS, more than 3 g/d of supplemental lysine did not improve performance.

中文翻译：

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51 补充赖氨酸在完成牛的饮食

Smartamine ML (Adisseo) 是一种生物可利用的 (80%) 赖氨酸和蛋氨酸来源，用于评估增加赖氨酸供应对肉牛生产性能的影响。杂交肉牛（n=120，初始体重 261 公斤）分别饲喂 15% 的改良酒糟加可溶物 (MDGS)、68% 的高水分和干玉米卷的混合物、12% 的玉米青贮饲料和 5% 的添加剂Smartamine ML 每天穿着。公牛被分配到 8 头赖氨酸，0 到 7 g/d，以 1 g 为增量，每个处理 15 头公牛。采用SAS的MIXED程序分析数据，作为广义随机设计，动物为实验单位，治疗为固定效应。正交对比评估线性、二次和三次响应。对比声明将对照与 1、2 和 3 g/d 处理进行了比较。饲喂增加量的生物可利用赖氨酸线性降低 DMI (P = 0.04)、最终活体重 (P = 0.04) 和 ADG (P = 0.02)，而对 G:F (P ≥ 0.27) 没有影响。DMI 和 ADG 的数值差异 (P ≥ 0.26) 导致与对照相比，1 g/d 处理的活 G:F 有改善的趋势 (P = 0.06)（分别为 0.188 和 0.176）。在 Optaflexx 饲喂期间 (d 163-195)，DMI 随着日粮中赖氨酸的增加呈线性下降 (P = 0.01)，而 ADG (P ≥ 0.13) 或 G:F (P ≥ 0.12) 没有差异，呈趋势 (P = 0.01)。 P = 0.08) 与对照相比，3 g/d 的活 G:F 得到改善（分别为 0.163 和 0.131）。随着日粮中 Smartamine ML 的增加，热胴体重量趋于线性下降（P = 0.07），对包括最长肌面积、第 12 肋骨脂肪和大理石花纹评分在内的其他胴体指标没有影响（P ≥ 0.18）。