This experiment was conducted to study the effects of dietary sanguinarine (SAN) on growth performance, intestinal mucosal morphology and immune function of small intestinal mucosa of weaned piglets. Thirty-six“Duroc×Landrace×Yorkshire”hybrid pigs with initial weight of (6.55±0.18) kg were randomly divided into three groups with twelve replicates per group and one pig per replicate according to similar body weight and the same ratio of gender. The pigs in the control group were fed a basal diet,those in antibiotic group were fed the basal ...