Department of Animal Sciences, Division Animal Nutrition Physiology, Georg-August-University, Goettingen, Germany.
J Anim Physiol Anim Nutr (Berl). 2010 Dec;94(6):e277-85. doi: 10.1111/j.1439-0396.2009.00969.x.
Optimal ratio of lysine (Lys) to threonine (Thr) in diets for growing barrows [genotype: Piétrain × (Large White × German Landrace)] was established at 30, 50, 70, 90 and 110 kg body weight (BW). N balance studies were conducted with diets based on constant mixture of wheat, barley, soybean meal and field peas. Supplementation of crystalline amino acids (AA) provided diets with Lys (diet A) and Thr (diet B) in first limiting position. For each BW range, totally 28 individual N balance data were utilized for assessing model parameters (exponential N utilization model) of dietary efficiency of Lys and Thr, respectively. Observed maximal dietary efficiency of Lys and Thr provided the database for conclusion of optimal dietary Lys to Thr ratio. Based on applied experimental conditions, BW dependent Lys to Thr ratio could not be concluded. On average, the dietary ratio Lys to Thr = 1:0.61 ± 0.02 was obtained as optimal for growing pigs.
生长育肥公猪[基因型：皮特兰×（长白猪×德国长白猪）]日粮中赖氨酸（Lys）与苏氨酸（Thr）的最佳比例分别在 30、50、70、90 和 110kg 体重（BW）时确定。采用基于小麦、大麦、豆粕和豌豆的恒定混合物的日粮进行氮平衡研究。添加结晶氨基酸（AA）为日粮提供了 Lys（日粮 A）和 Thr（日粮 B）处于第一限制位置。对于每个 BW 范围，共使用 28 个个体氮平衡数据分别评估 Lys 和 Thr 的日粮效率模型参数（指数型氮利用模型）。观察到的 Lys 和 Thr 的最大日粮效率为最佳日粮 Lys 与 Thr 比提供了数据库。基于应用的实验条件，无法得出依赖 BW 的 Lys 与 Thr 比。平均而言，获得了最佳的生长猪日粮 Lys 与 Thr 比为 1:0.61±0.02。
