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

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(P0.05);各组之间肝脏、肾脏重量均无显著差异(P0.05);相对于对照组,Ⅰ组显著降低血清中尿酸含量(P0.05),Ⅱ组球蛋白含量显著降低(P0.05),Ⅲ组显著降低血清中直接胆红素的浓度(P0.05);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(P0.05),MDA含量则显著降低(P0.05)。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。

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

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 (P＜0.05).There was no significant difference (P＞0.05) in liver and kidney weight between treatment groupa and the control.The serum uric acid in group Ⅰ was significantly decreased (P＜0.05).Meanwhile,the globulin content in group Ⅱ and the serum direct bilirubin concentration in group Ⅲ were significantly decreased (P＜0.05).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 (P＜0.05) 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.