本试验旨在研究蒲公英粗多糖对断奶至3月龄生长肉兔生长性能及免疫功能的影响,为开发应用新型饲料添加剂提供依据。选择160只平均体重为(650±50) g的35日龄的断奶仔兔,随机分为4组,每组2个重复,每个重复20只兔。对照组(Ⅰ组)饲喂基础饲粮,试验组(Ⅱ、Ⅲ、Ⅳ组)分别在基础饲粮中添加0.1%、0.3%、0.5%的蒲公英粗多糖。试验期为50 d。结果表明:1)Ⅲ、Ⅳ组分别平均日增重显著(P<0.05)和极显著(P<0.01)高于对照组,Ⅳ组料重比极显著低于对照组和Ⅱ组(P<0.01)。2)Ⅱ、Ⅲ、Ⅳ组胸腺指数极显著高于对照组(P<0.01),Ⅲ、Ⅳ组脾脏指数极显著高于对照组(P<0.01)。3)各组血清免疫球蛋白A含量无显著差异(P>0.05);Ⅲ、Ⅳ组血清免疫球蛋白M含量极显著高于对照组(P<0.01),免疫球蛋白G含量显著高于对照组(P<0.05)。由此可见,饲粮中添加蒲公英粗多糖可提高断奶至3月龄生长肉兔的生长性能和免疫功能,适宜添加量为0.5%。

This experiment was conducted to study the effects of Taraxacum polysaccharides on growth performance and immune function of growing meat rabbits from weaner to 3 months of age, and to provide a theoretical support for exploitation of a new-style feed additive. A total of 160 35-day-old weaner rabbits with average body weight of (650±50) g were randomly allocated into 4 groups with 2 replicates per group and 20 rabbits per replicate. The control group (group Ⅰ) was fed a basal diet and experimental groups (groups Ⅱ, Ⅲ and Ⅳ) were fed the basal diets supplemented with 0.1%, 0.3% and 0.5% Taraxacum polysaccharides, respectively. The experiment lasted for 50 days. The results showed as follows: 1) the average daily gain in groups Ⅲ and Ⅳ was significantly higher than that in control group (P<0.05 and P<0.01,respectively), the ratio of feed to gain in group Ⅳ was significantly higher than that in control group and group Ⅱ (P<0.01). 2) The spleen index in groups Ⅱ, Ⅲ and Ⅳ was significantly higher than that in control group (P<0.01), and the thymus index in groups Ⅲ and Ⅳ was significantly higher than that in control group (P<0.01). 3) There was no significant difference in serum immunoglobulin A content among all groups (P>0.05), and the serum immunoglobulin M content in groups Ⅲ and Ⅳ was significantly higher than that in control group (P<0.01), the serum immunoglobulin G content in groups Ⅲ and Ⅳ was significantly higher than that in control group (P<0.05). It is concluded that dietary Taraxacum polysaccharides can improve growth performance and immune function of growing meat rabbits from weaner to 3 months of age,the appropriate supplementation is 0.5%.