Effect of dietary supplementation of encapsulated Lactobacillus paracasei on intestinal morphology and barrier integrity: HE staining showing the morphological structure of intestinal tissues (A), villus height, crypt depth and ratio of villus height to crypt depth(V/C) of djuodenum (B–D), jejunum (E–G), and ileum (H–J), expression of tight junction proteins of duodenum and jejunum quantified against housekeeping gene β- actin: ZO-1 (K), Claudin-1 (L) (n = 6–8 per group). The data are presented as the mean ± SEM. *P < 0.05, **P < 0.01, ***P < 0.001. Treatments: CON = a basal diet; ANT = CON+0.15 ppm Virginiamycin; ELP = CON+500PPM of encapsulated Lactobacillus paracasei.