This test was conducted to study the effects of different doses of homologous probiotics on intestinal mucosa structure of 21-day-old broilers. A total of1 500 one-day-old AA broilers with similar weight were randomly divided into five groups,with 10 replicates in each group and 30 broilers( half males and half females) in each replicate. The broilers were fed with the diets containing five kinds of different doses of homologous probiotics. The broilers ate and drank freely during the test. The test lasted for 21 days. Histological and histochemical methods were taken to measure villi length,mucosal thickness,wall thickness and the ratio of villi length to crypt depth( V / C) of duodenum,jejunum and ileum of the 21-day-old broilers. The results showed that,the effects of 0. 3% homologous probiotics on the intestinal mucosal structrue of 21-day-old broilers were the best,and values of villi length,V / C,mucosal thickness and intestinal wall thickness in the 0. 3% homologous probiotics group reached the maximum. The effects on improving and enhancing the digestion and absorption of the broiler small intestine in the 0. 3% homologous probiotics group were the best.
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