中文摘要：

本试验研究了日粮中添加不同浓度的猪源发酵乳酸杆菌（Lactobacillus fermentum）对保育猪生长性能、养分表观消化率、粪便微生物数量和血清免疫指标的影响.选择160头保育猪,日龄为（30±2）d,体重为（7.85±0.68）kg,随机分成4组,每组4个重复,每个重复10头猪.对照组饲喂基础日粮,试验组在基础日粮中分别添加0.1％、0.2％和0.3％的猪源发酵乳酸杆菌制剂,试验期35 d.结果显示,添加不同浓度猪源发酵乳酸杆菌对保育猪的各项指标均有改善效果,其中,0.2％发酵乳酸杆菌组的效果最好,与对照组相比,其平均日增重提高8.70％（P＜0.05）,料重比降低4.62％ （P＜0.05）,日粮中粗蛋白质、钙和总磷的表观消化率显著提高（P＜0.05）,粪便中大肠杆菌数量显著下降（P＜0.05）,血清中IgG含量提高了8.39％ （P＜0.05）.因此,在保育猪饲料中添加猪源发酵乳酸杆菌能够提高机体免疫力和生长性能,提高日粮中粗蛋白质、钙和总磷的表观消化率,降低粪便中的大肠杆菌数量.

英文摘要：

This experiment was conducted to study the effects of Lactobacillus fermentum on growth performance,nutrient apparent digestibility,faecal microflora number and serum immune indices of weaned piglets.A total of 160 weaned piglets with an average age of （30±2） days and averge body weight of （7.85±0.68） kg were randomly distributed into 4 groups with 4 replicates per group and 10 piglets per replicate feeding basal diet,0.1％,0.2％,and 0.3 ％ Lactobacillus fermentum supplementation diets,respectively.The experiment lasted for 35 d.The results showed that,compared with the control group,the average daily gain,the feed conversion ratio,the apparent digestibility of crude protein,calcium and total phosphorusin of Lactobacillus fermentum groups were all increased in varying degrees.The optimum supplemental level of Lactobacillus fermentum should be 0.2％,and at this level,the average daily gain was significantly increased by 8.70％ （P＜0.05）,the F/G was decreased by 4.62％ （P＜0.05）,the apparent digestibility of crude protein,calcium and total phosphorus were significantly increased （P＜0.05）,the number of faecal E.coli was significantly decreased （P＜0.05）,and the serum IgG was significantly increased by 8.39％ （P＜0.05）.The results indicated that Lactobacillus fermentum supplementation could improve the immune function,growth performance,the apparent digestibility of crude protein,calcium and total phosphorus and reduce the number of faecal E.coli of weaned piglets.