本试验旨在研究饲粮中精氨酸水平对1～3周龄雌性爱拔益加（AA）肉仔鸡的影响，并运用二次曲线模型进行需要量估计。试验选用540只1日龄雌性AA肉仔鸡，随机分成6组，每组5个重复，每个重复18只鸡。6个组饲粮精氨酸水平分别为1.000%、1.125%、1.250%、1.375%、1.500%和1.625%。结果表明：精氨酸水平极显著影响1～3周肉仔鸡的体重（P=0.000）和平均日增重(P=0.000)，显著影响血清中胰岛素（P=0.030）和尿酸（P=0.023）的水平，显著影响脂多糖（LPS）刺激的淋巴细胞增殖转化率（P=0.050）；随着饲粮精氨酸水平的提高，单核细胞吞噬率有增加的趋势（P=0.063，PL=0.009），隐窝深度有线性降低的趋势（PL=0.075），绒毛高度/隐窝深度值有线性增加的趋势（PL=0.075）；胸肌率随饲粮精氨酸水平的提高呈现二次增长趋势（P=0.026，PQ=0.005），胸肌内脂肪水平随饲粮精氨酸水平的提高现线性降低（PL=0.008；PL=0.008）。二次曲线分析表明，当饲粮表观代谢能为12.34 MJ/kg、蛋白质为20.50%、赖氨酸为1.10%时，以平均日增重为评价指标，1～3周龄雌性AA肉仔鸡精氨酸最佳需要量为1.38%；以胰岛素水平和胸肌率为评价指标，精氨酸最佳需要量分别为1.39%和1.35%。

This experiment was conducted to study the effects of dietary arginine levels on female AA broilers aged from 1 to 3 weeks and to estimate the arginine requirement using a quadratic curve  model. Five hundred and forty 1-day-old female AA broiler chicks were randomly divided into 6 groups, and each group had 5 replicates of 18 chicks each. Six groups were fed diets supplemented with arginine at the level of 1.000%, 1.125%, 1.250%, 1.375%, 1.500% and 1.625%, respectively. The results showed that the levels of dietary arginine significantly affected the body weight (P=0.000) and the average daily gain (P=0.000) of female broilers, the levels of insulin (P=0.030) and uric acid (P=0.023) in the serum, and lymphocyte proliferation and transformation rate stimulated by LPS (P=0.050) With the increasing of dietary arginine level, it tended to improve the monocyte phagocytic rate (P=0.063，PL=0.009), reduce the depth of crypt (PL=0.075), and increase the ratio of villus height to crypt depth of jejunum (PL=0.075). The breast muscle ratio showed positive quadratic responses to the increasing of dietary arginine level (P=0.026，PQ=0.005). The fat in the breast muscle showed positive linear responses to the increasing of dietary arginine level (PL=0.008；PL=0.008). Based on the average daily gain, the insulin level and the breast muscle ratio of female broiler chicks, the optimal level of arginine is 1.38%, 1.39% and 1.35% for 1 to 3 weeks chicks, respectively, when the levels of protein, lysine and AME are set at 20.50%, 1.10% and 12.34 MJ/kg in diets.［Chinese Journal of Animal Nutrition，2011，23（4）：571 -577］