Department of Poultry Science, University of Georgia, Athens, GA 30602, USA.
CJ Corporation, Jung-gu, Seoul 100-400, South Korea.
Poult Sci. 2019 Apr 1;98(4):1716-1722. doi: 10.3382/ps/pey504.
This study evaluated the effects of crystalline arginine (Arg) on performance and body composition in male broilers. A total of 600 1-day-old Ross 308 broilers were distributed in a completely randomized design, with 5 treatments and 6 replicates of 20 birds. The treatments were given as a percentage of the Ross 308 requirement, and defined as 70, 80, 90, 100 (Ross 308 requirement), and 110% of Arg. Body weight gain (BWG), feed intake (FI), and feed conversion ratio (FCR) were evaluated at 10, 24, and 42 d. Bone growth was measured from 7 to 11 d using mineral apposition rate (MAR) technique. At 42 d, 2 birds per pen were euthanized for bone mineral density (BMD) and body composition measurement using dual-energy X-ray absorptiometry, and liver gene expression and muscle diameter size analysis. The means were subjected to ANOVA and, when significant (P ≤ 0.05), were compared by Dunnett's test. Regression analyses were performed to evaluate trends of Arg dose response. Birds fed 70 and 80% of Arg had lower BWG than the ones fed 100% of Arg (P < 0.001), with quadratic effects for all phases (P < 0.001, R2 = 0.94). The 70% of Arg group showed lower FI compared to 100% from 11 to 24 d and 1 to 42 d (P < 0.009), with quadratic and linear effects (P < 0.049, R2 > 0.72), respectively. The 70% of Arg group showed higher FCR compared to 100% (P < 0.0001) with quadratic effects (P < 0.002, R2 > 0.94) for all periods. At 42 d, the 70% of Arg group showed lower BMD, tissue, and lean muscle percentage than 100% of Arg. There was a quadratic effect of Arg levels on lean muscle (P = 0.046, R2 = 0.89). Therefore, the dietary supplementation with Arg is necessary as it leads to an overall body growth with increased lean deposition and BMD, without increasing fat accretion in Ross 308 broiler chickens.
本研究评估了结晶精氨酸（Arg）对雄性肉鸡性能和体组成的影响。将 600 只 1 日龄的罗斯 308 肉鸡采用完全随机设计，分为 5 个处理组，每组 6 个重复，每个重复 20 只鸡。处理组以罗斯 308 的需求为基础，分别为 70%、80%、90%、100%（罗斯 308 的需求）和 110%的 Arg。在第 10、24 和 42 天评估体重增重（BWG）、采食量（FI）和饲料转化率（FCR）。第 7 至 11 天，采用矿化率（MAR）技术测量骨生长。第 42 天，每个笼舍随机选取 2 只鸡进行安乐死，使用双能 X 射线吸收仪测量骨密度（BMD）和体成分，分析肝脏基因表达和肌肉直径大小。平均值进行方差分析，当差异显著（P ≤ 0.05）时，采用 Dunnett 检验进行比较。进行回归分析以评估 Arg 剂量反应的趋势。与 100%Arg 组相比，饲喂 70%和 80%Arg 的肉鸡的 BWG 较低（P < 0.001），所有阶段均呈二次效应（P < 0.001，R2 = 0.94）。70%Arg 组从第 11 天到第 24 天和从第 1 天到第 42 天的 FI 均低于 100%Arg 组（P < 0.009），具有二次和线性效应（P < 0.049，R2 > 0.72）。70%Arg 组的 FCR 显著高于 100%Arg 组（P < 0.0001），所有时期均呈二次效应（P < 0.002，R2 > 0.94）。在第 42 天，70%Arg 组的 BMD、组织和瘦肉百分比低于 100%Arg 组。Arg 水平对瘦肉有二次效应（P = 0.046，R2 = 0.89）。因此，在罗斯 308 肉鸡中，Arg 的日粮补充是必要的，因为它可以促进整体生长，增加瘦肉沉积和 BMD，而不会增加脂肪沉积。
