CLINICO PATHOLOGICAL INVESTIGATION OF NEWCASTLE DISEASE IN BROILER CHICKEN AT SADAR UPAZILA OF DINAJPUR

Abstract

This study was carried out to investigate the prevalence and pathological lesions of Newcastle disease in different small scale commercial broiler farm at Dinajpur sadar upazila from July to December 2018. Newcastle disease in commercial broiler farms causes huge economic loss through a relatively high mortality and loss of production. In the present study, a total of 1600 birds from 5 farms were observed. Infected birds on the basis of clinical signs, post mortem and histopathological lesions. The highest prevalence found in F1 farm (10%) and lowest prevalence found in F5 farm (5.33%) which was not significant (p<0.05). Highest mortality was found in non vaccinated birds (20.69%) and lowest in vaccinated birds (6.67%) which was statistically significant (p<0.05). The overall prevalence of Newcastle diseases at different farms of Dinajpur sadar upazila were not significantly varied. Mortality rate in non vaccinated birds was 3.10% times higher than vaccinated birds which was statistically highly significant (p<0.05). The most frequent clinical signs were sneezing, gasping, coughing. Broiler were totally inactive, weak and rough in appearance. Greenish diarrhoea was also found occurred. Nervous sign include clonic, spasm and paralysis of the legs. NDV infected birds showed were haemorrhages in the proventiculus, caecal tonsils and intestine. Histopathological changes in proventiculus were congested blood vessels, haemorrhages, globular destruction and severe epithelial layer destruction.