author(s)
SD Kadam, JY Waghaye and PN Thakur

abstract
The present study was carried out to observe histomorphology of bursa of fabricius from one to four weeks of age in Japanese quail birds. Bursa of fabricius was composed of tunica mucosa, tunica muscularis and tunica serosa in all age group of birds. The mucosal folds were lined by interfollicular epithelium and follicle associated epithelium. The interfollicular epithelium was composed of pseudostratified columnar epithelium. The lamina propria formed the core of bursal mucosal fold and was consisted of lymphoid follicles with few other cells. Bursal follicle was composed of outer darker cortex and inner light medulla. The cortical cellular population was found to be increase with the advancement of the age. The medulla was consisted loosely arranged lymphocytes, lymphoblasts, epithelial reticular cells with few dendritic cells, macrophages and plasma cells.