Histoarchitectural Studies on Bursa of Fabricius of Kadaknath Birds

The study was conducted on thirty specimen of bursa of Fabricius from day old to twenty six weeks old Kadaknath birds. Formalin fixed samples were processed by routine paraffin embedding technique and subjected to histological study. The histoarchitectural observation on bursa of Fabricius revealed that, it was composed of four tunics. The bursal mucosa was lined by pseudostratified columnar epithelium except at crypts it became simple columnar. Bursal epithelium had four types of cells as type-I, type-II, type-III and type-IV. Presence of melanocytes in bursa of Fabricius was unique characteristic feature of present study which was fusiform cell with elongated nuclei in the cytoplasm was generally occurred in all component of bursa of Fabricius. There was complete regression of bursa of Fabricius after 25^th week of age.