By scan and transmission electricity microscope detective healthy and infectious coccidian fowl digestive tract normal flora ultrastructure,Found that healthy fowl digestive tract(crop、ileum and caecum ) mucosa facial have a number of normal flora .there are a number of lacticbacillus in the facial of crop mucosa ,and see the state of lactobacillus adhering to intestinal epithelial cells;Choose for host specific and bacterium strain specific high adhesion Lactobacillu(sSDn A、SDnB7 and SDnE1 ); s...