L-精氨酸对冬季低温下产蛋初期攸县麻鸭产蛋、血液指标和肝脏抗氧化功能的影响

Effects of L-arginine on laying performance, blood biochemical indices and liver antioxidant function of Youxian ducks during the earlier laying period under low-temperature in winter

为了考察冬季低温下不同L-精氨酸添加水平对产蛋初期攸县麻鸭产蛋、血液指标和肝脏抗氧化功能的影响。选择90日龄体重相近的健康攸县麻鸭240只,随机分为4个处理组,每个处理设6个重复,每个重复10只,饲养温度为冬季低温,分别饲喂L-精氨酸添加量为0.0%(CK)、0.2%(Ⅰ组)、0.5%(Ⅱ组)和0.8%(Ⅲ组)的基础饲粮,试验期42 d。试验结果表明,Ⅱ组显著提高了第2周、第3周、第4周和全期产蛋率(P<0.05);各组之间肝脏、肾脏重量均无显著差异(P>0.05);相对于对照组,Ⅰ组显著降低血清中尿酸含量(P<0.05),Ⅱ组球蛋白含量显著降低(P<0.05),Ⅲ组显著降低血清中直接胆红素的浓度(P<0.05);与对照组与相比,试验Ⅰ、Ⅱ、Ⅲ组肝脏中CAT、SOD含量均显著升高(P<0.05),MDA含量则显著降低(P<0.05)。综合分析,冬季低温下添加0.568%~0.593%的L-精氨酸有利于提高产蛋初期攸县麻鸭产蛋率,提高肝脏组织的抗氧化能力,改善肝脏功能。

The research was aimed to study the effects of dietary L-arginine（Arg） level on laying performance, blood biochemical indices and liver antioxidant function of Youxian ducks during the earlier laying period under low-temperature in winter. A total of 240 healthy Youxian ducks（90 days of age） with nearly the same body weight were selected and randomly assigned to 4 groups with 6 replicates in each group and 10 ducks in each replicate. Under low-temperature in winter, ducks were fed with the basal diet supplemented with 0.0%（CK）, 0.2%（group Ⅰ）, 0.5%（Group Ⅱ）, or 0.8%（Group Ⅲ） L-Arg. The experiment lasted for 42 days. The experimental results showed that： ducks in group Ⅱ significantly increased the laying rate at the second, third, and fourth week and the total laying rate（P0.05）. There was no significant difference（P0.05） in liver and kidney weight between treatment groupa and the control. The serum uric acid in group Ⅰ was significantly decreased（P0.05）. Meanwhile, the globulin content in group Ⅱ and the serum direct bilirubin concentration in group Ⅲ were significantly decreased（P0.05）. The contents of SOD（superoxide dismubase） and CAT（catalase） in the liver of group Ⅰ, Ⅱ and Ⅲ were significantly increased, while the content of MDA（malonaldehyde） was significantly decreased（P0.05） compared with the control. In conclusion, basal diet supplemented with 0.568%-0.593% L-Arg could improve the laying rate and liver antioxidant capacity of Youxian ducks during the earlier laying period under low-temperature in winter.