PREVALENCE AND PATHOLOGY OF COLIBACILLOSIS IN DIFFERENT BROILER FARM AT DINAJPUR SADAR UPAZILA

Abstract

This study was carried out to investigate the prevalence and pathological lesions of avian colibacillosis in different commercial broiler farm at Dinajpur sadar upazila with variation of age of birds from July to December, 2018. Colibacillosis in commercial broiler farms causes huge economic loss through a relatively high mortality and loss of production. In the present study, a total of 8800 birds from 6 farms were observed and diagnosed infected birds on the basis of clinical signs, post mortem lesions and histopathological lesions. Among them highest prevalence found in F1 farm (76.2%) and lowest prevalence found in F6 farm (9.16%) which was statistically highly significant (p<0.05). Highest mortality found in F1 farm (9.1%) and lowest in F6 farm (3.27%) which was statistically significant (p<0.05). Average prevalence and mortality of six farms of Dinajpur sadar upazila was 39.63% and 5.39%, respectively. On the basis of age, highest prevalence found in 0-2 weeks of age (69.3%) and lowest in 2-4 weeks of age (9.64%) which was statistically highly significant (p<0.05) for colibacillosis. The most frequent gross lesions of colibacillosis were air sacculitis omphalitis, pericarditis, perihepatitis, peritonitis and enteritis. The microscopic lesions of these conditions were haemorrhage and highly congestion in lung, destruction of intestinal wall and reactive cell infiltration, thickening of fibrous tissue in pericardium.