Abstract: The effects of compound gastrointestinal microbial modulator(CGMM)on growth performance and small intestinal structure of weaned pigs were investigated. Eighty piglets (Duroc×Landrace×Yorkshire) weaned at 30th day were randomly divided into four groups, such as control group(CG), antibiotic group(AG), experimental group one(EG1), experimental group two(EG2). The experimental results showed that: ⑴ The average daily gain(ADG) of EG1, EG2 and AG were significantly higher than that of CG (P<0.05). (2)Serum albumin, blood urea nitrogen, total cholesterol, GPT showed no significant difference among four groups (P>0.05). The total protein (TP) of EG1, EG2 and AG was higher than that of CG, and the serum urea content was lower.(3)The villus height of duodenum in EG1 was significantly higher than the other groups (P<0.01), so was the villus height of jejunum between each groups. The crypt depth of jejunum of EG1 was significantly shorter than that of other groups (P<0.01)．

Key words: weaned piglet, compound gastrointestinal microbial modulator, growth performance, villus height, crypt depth