Abstract:The experiment aimed to investigate the effects of three probiotic fermented traditional Chinese medicine preparations on the production performance,serum biochemical indices and immune function of weaned lambs.A total of 100 small-tailed Han sheep with similar appearance and body weight(15.19±0.81) kg were selected and randomly divided into 5 groups,with 4 replicates in each group and 5 sheep in each replicate.Group Ⅰ,Ⅱ,Ⅲ and Ⅳ were supplemented with 0%,0.5%,1.0% and 1.5% fermented traditional Chinese medicine preparations to the basic diet,while group Ⅴ were added 1.0% pure compound herbal supplements to the basic diet,with a pre-trial period of 3 days and a main trial period of 40 days.The results showed that the average body weight of the test groups Ⅲ,Ⅳ,and Ⅴ was significantly higher than that of the control group(P<0.05),and there was a significant difference between group Ⅱ and Ⅳ(P<0.05);the ADG of the test groups Ⅱ,Ⅲ,Ⅳ,and Ⅴ was significantly higher than that of the control group(P<0.05),and there were significant differences between groups Ⅱ,Ⅲ,Ⅳ,and Ⅴ and group Ⅱ(P<0.05),and between groups Ⅳ and Ⅲ,and Ⅴ(P<0.05);the ADFI of the test groups Ⅲ,Ⅳ,and Ⅴ was significantly higher than that of the control group(P<0.05),and there was a significant difference between groups Ⅱ and Ⅳ(P<0.05).The TP content of the test groups Ⅲ,Ⅳ,and Ⅴ was significantly higher than that of the control group(P<0.05);the GLO content of the test groups Ⅲ,Ⅳ,and Ⅴ was significantly higher than that of the control group(P<0.05),and there was a significant difference between groups Ⅲ and Ⅰ,Ⅱ(P<0.05);the ALP content of group Ⅲ was significantly higher than that of the control group(P<0.05).The IL2 content of groups Ⅲ and Ⅳ was significantly higher than that of the control group(P<0.05),and there was a significant difference between groups Ⅲ,Ⅳ and Ⅱ(P<0.05);the IgA content of the test groups Ⅱ,Ⅲ,Ⅳ,and Ⅴ was significantly higher than that of the control group(P<0.05),and there were significant differences between groups Ⅲ,Ⅳ and Ⅱ,Ⅴ(P<0.05);the IgG content of group Ⅲ was significantly higher than that of the control group(P<0.05),and there was a significant difference between groups Ⅱ and Ⅲ(P<0.05).In conclusion,the three probiotic fermented traditional Chinese medicine preparations can significantly improve the productive performance and immune function of weaned lambs,and can also improve their blood biochemical indicators,with the optimal addition ratio is 1.0%.