Distribution and histology of Fabricius’bursa-associated lymphoid tissues (FBALT) in muscovy duck

The distribution and histology of lymphoid tissue in the Fabricius’bursal stalk were studied.There were large amount of lymphoid tissue in Fabricius’bursal stalk.The largest distribution area and the great quantity were at the dorsum of the stalk.The bursa-associated lymphoid tissues included follicle associated epithelia (FAE), intro-epithelial lymphocyte (IEL), dome area, lymphoid follicles and highendothelial venules.Their structures were similar to other mucosa-associated lymphoid tissues (MALT).The results indicated that the lymphoid tissue of Fabricius’bursal stalk was one kind of the MALT.