Age-related development and histomorphological observations of bursa of fabricius in sonali chicken

The aim of this research was to investigate the age related histomorphological and involutory changes of bursa of Fabricius of sonali chicken at different postnatal stages in Bangladesh. The present research was carried out on bursa of 25 healthy sonali chicken representing different stage of postnatal life; Day 1, Day 14, Day 28, Day 42 and Day 56. Sample (bursa) was collected after sacrificing the chickens by cervical subluxation method. Harris's Haematoxylin and 1% Eosin Y stain was done to facilitate microscopic study. Grossly, the bursa was smooth, yellowish to milkish white in color. The average weight gain, length, width and thickness of bursa was developed parallel with age and found statistically significant (p<0.001). Age dependent changes were noticed in number of follicle per plicae, length and breadth of plicae, length and breadth of follicle, thickness of cortex and breadth of medulla of follicle, height of lining epithelium and thickness of tunica muscularis and found to be developing significantly (p<0.05) from Day 1 to Day 56. No involutory signs were found during study period. From the present study, it might be concluded that the growth and development of bursa of sonali chicken in Bangladesh was age related. The findings of this experiment would help to give an idea about the immune status of sonali chicken and provide a basis for further immunization research at different postnatal stages of development in sonali chicken.