PATHO–PREVALENCE OF DUCK CHOLERA IN SELECTIVE UPAZILAS OF BOGURA DISTRICT

Abstract

A pathological study was conducted on Duck cholera occurring in selective Upazila of Bogura district of Bangladesh during the period from July 2017 to December 2017 to know the prevalence of Duck cholera, gross and histopathological change of different organs and to identify the effect of age and sex for developing the disease. A total of 207 ducks either sick or dead were examined at different Upazilla Veterinary hospital of Bogura district out of which 23 ducks were found to be positive on duck cholera. The diagnosis of Duck cholera was performed on the basis of history of the affected flock, clinical signs, post mortem examinations, pathological findings, age and sex of affected birds. The major clinical manifestations in the ducks suffering from natural Duck cholera were found as depression and ruffled feather, lameness, greenish diarrhea, Feathers around vent soiled with greenish diarrhea and swollen hock joint with thickening in the skin of footpad. In this study, the overall prevalence of Duck cholera in Bogura district was 11.11% which is followed by 13.95% in Sariakandi, 13.51% in Sonatola, 11.76% in Dhonut, 9.68% in Bogura sadar, 9.09% in Gabtoli and 6.90% in Sherpur upazila. According to the age group of ducks, It was significantly (p>0.01) higher among >2–8 weeks of age (18.52%) which is followed by among >8-20 weeks (10.13%), between 0-2 weeks of age (0%) and among >20 weeks of age (0%). Present study found the prevalence of Duck cholera between sex group and it was significantly (p<0.05) higher in female (14.08%) than in male (4.62%) ducks. Main gross findings in affected ducks were haemorrhage on liver, enlargement of liver, pin point haemorrhage on heart, extravassation of heart blood, Straw color pericardial fluid in heart and Enlarged, haemorrhagic and congestion of Spleen. Histopathological findings were dilated central vein, more acidophilic cytoplasm of the hepatocytes, reactive cells infiltration, dilated sinusoids, mild to moderate level of hepatocytic destruction, bacterial colony in liver parenchyma. Present study suggests that Duck cholera is prevalent among the duck farm of Bogura district. So effective control measures should be taken to minimize this problem.