Abstract: In order to study the effect of the symbiotic ferment culture of Lactobacillus rhamnosus and Saccharomyces cerevisiae on serum biochemical parameters and morphology of duodenum of broilers, 240 one-day-old broilers for a experimental period of 42 days,were randomly allotted into six groups, each with four replicates,and each replicate contain ten broilers.The control group was provided with basic diet,the antibiotic group was fed with basic diet supplemented with aureomycin at the level of 600 mg/kg, and the four test groups were fed with basic diet by providing water containing the complex probiotics,at the level of 0.1%,0.5%,1.0%,1.5%,respectively. The results showed that the concentration of Ca,P,total albumen,albumin and alobulin were significantly increased in serum of broilers by the complex probiotics (P＜0.05),the concentration of total cholesterin and the proportion of albumin and globulin were decreased significantly (P＜0.05),and the length of the villus in duodenum of broilers was increased significantly (P＜0.05),the morphological characteristics of mucosal in duodenum was also improved. The results indicated that the complex probiotics had a certain impact on some biochemical in serum and duodenal morphology for broilers.

Key words: complex probiotics; Lactobacillus rhamnosus; Saccharomyces cerevisiae; broiler; serum biochemical parameter; duodenum