The effect of HGT on gene expression of tight junction proteins in intestinal mucosa of broilers. Values are means of 6 replicates per treatment with 1 bird each. CLDN-1, OCLN, and TJP-1 are the genes that encode claudin1, occludin, and tight junction protein1, respectively. CON group: basal diet; 150 mg/kg HGT group: basal diet added with 150 mg/kg HGT; 300 mg/kg HGT group: basal diet added with 300 mg/kg HGT; 450 mg/kg HGT group: basal diet added with 450 mg/kg HGT. a–bMeans in the same row without the same superscript differ significantly (P < 0.05). Error bar stands for SEM.