author(s)
D Mahanta, M Mrigesh, S Khargharia, G Bordoloi, LS Khuman, K Saikia, A Baruah, K Boruah, MK Kalita and S Nath

abstract
The present study was conducted on the major lymphoid organs i.e. thymus, spleen and bursa of Fabricius of 24 birds of the local hill fowl of Uttarakhand (Uttara Fowl) and 24 birds of Rhode Island Red (RIR) divided into four age groups viz. day old, 1 month, 3 months and 6 months old birds with six birds in each age group. The capsule, trabeculae and Hassall’s corpuscles of thymus showed PAS positive and Alcian blue activities in both the birds. In case of the spleen of both Uttara fowl and RIR the capsule, blood vessels and some cells of white pulp showed moderate PAS positive activity. The apical border of surface epithelium of bursa of Fabricius showed PAS positive and Alcian blue activities in both the birds.