1～3周龄雌性肉仔鸡精氨酸需要量

摘要

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,Pa = 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]%本试验旨在研究饲粮中精氨酸水平对l～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l～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%.