| dc.description.abstract | 8 broiler farms with sum of 3250 birds of various age group from four different
upazila like Sadar, Birol, Birgonj and Kaharol were suspected for Infectious Bursal
Disease (IBD) and studied during the period from July to December, 2012. On the
basis of detail about farm history, clinical signs and postmortem investigation of
infected chicks, the prevalence of IBD was 11.11%, 10.4%, 9.06% and 9.11% in
Sadar, Birol, Birgonj and Kaharol upazila, respectively with an overall prevalence
10.03% at Dinajpur district. The prevalence of IBD in broiler chickens was the
highest (13.13%) at 4"" week of age and the lowest (5.6%) at 6" week of age. No
broiler chick was identified as positive for IBD in their first two weeks of age. The
highest mortality was observed at Kaharol upazila (5.11%) and the lowest (3.2%) at
Birol upazila, with total mortality rate 4.27%. The necropsy findings of infected
chicks revealed haemorrhages on thigh and brest muscles; enlarged, edematous,
hyperemic and haemorrhagic bursa of fabricious followed by atrophy. In some
cases kidneys were found swollen. Severe lymphoid depletion and reactive cells
infiltration in the interfollicular space were found in histopathological studies.
Therefore, it was concluded that susceptibility of chicks to IBD is influenced by its
age. Ruffled feather, depression, whitish diarrhoea with haemorrhagic muscles and
inflamed, edematous, hyperemic bursa of fabricious is attributable to infectious
bursal disease (IBD). | en_US |
