壳聚糖对仔猪生长性能及血清中类胰岛素生长因子-Ⅰ和生长激素水平的影响

本文旨在研究日粮中添加不同剂量壳聚糖对仔猪生产性能及血清中类胰岛素生长因子-I(IGF-I)和生长激素(GH)水平的影响。试验选择60日龄大白×长白×VI系杂交仔猪96头,随机分为4个日粮处理组,每个处理3个重复,每个重复8头,进行为期21 d的饲养试验。4种日粮分别是在基础日粮中添加0、0 .01 %、0 .05 %、0.1 %的壳聚糖配制而成。结果表明,壳聚糖对仔猪生长性能的影响呈二次剂量依赖关系,添加0 .01 %~0 .05 %壳聚糖能够提高仔猪平均日增重、平均日采食量及增重耗料比,并可提高仔猪血清中IGF-Ι和GH含量。而添加更高水平时生长性能却有下降趋势。因此,在本试验条件下初步得出,0 .01 %~0 .05 %为壳聚糖在仔猪日粮中的适宜添加量。

Effects of Dietary Supplementation of Chitosan on Growth Performance and Serum IGF-I and GH in Piglets

The study was conducted to determine the effects of chitosan on growth performance and the concentrations of insulin-like growth factor-I (IGF-I) and growth hormone (GH) in serum of piglets. A total of 96 piglets at the age of 60 days were randomly divided into 4 treatments, each treatment consisted of 3 replicates with 8 piglets. The four treatments were fed with the basal diet supplemented with 0, 0.01%, 0.05%, 0.1% chitosan. The experiment lasted for 21 days. The results showed that chitosan improved growth performance in a quadratic dose-dependent pattern, and the supplementation of 0.01%~0.05% chitosan to the diet increased average daily gain (ADG), average daily feed intake (ADFI) and the ratio of gain to feed intake (G/F), and also increased the contents of IGF-I and GH in serum. However, the addition of 0.1% chitosan to diet showed negative effects on performance. So, the appropriate supplemental dosage of chitosan in the diets of piglets was 0.01%~0.05%.