H&E staining of duodenum, jejunum, and ileum of weaned piglets. (a) Pathological changes of duodenum in three groups of weaned piglets. (b) Pathological changes of jejunum in three groups of weaned piglets. (c) Pathological changes of ileum in three groups of weaned piglets. (d) Villi height of duodenum, jejunum, and ileum in three groups. (e) Crypt depth of duodenum, jejunum, and ileum in three groups. (f) The ratio of the villi height of the duodenum, jejunum, and ileum to the crypt depth in three groups. (g) The average area of ileum lymph nodes in three groups. (The scale of the figures from left to right is 1 mm, 200 μm, 100 μm). Repeated five times for each group (n = 5). (*, P < 0.05).