Figure 4

Histopathological observation of the digestive system. Histopathological observation of the digestive system including live, pancreas and duodenum: (g) showed that there existed a tiny amount of red blood cells in the interlobular veins and sinusoid and a bit of inflammatory cells infiltration in portal areas from a specific pathogen- free piglets killed at 10 dpi. (HE. ×200), but no various pathological lesions were observed at other parts of the liver at 10 dpi. (h. HE. ×200); (i) and (j) manifested subtle congestion among pancreas islets and foci of hemorrhage in some pancreas islet, a little of infiltration was inferred as pancreatic juice or electrolyte inner interlobular duct at 21 dpi. (HE. ×200); however, non-specific histopathological lesions of the duodenum except a tiny amount red blood cells in venule of muscularis mucosae and outer longitudinal muscle was observed and could be pictured as normal histological graph (k, at 3 dpi. HE. ×200; l, at 24 dpi, HE. x200).