Gross and histopathological changes in different organs in broiler birds naturally affected with colibacillosis

摘要

The present study was done to examine gross and histopathological changes in different organs viz. liver, heart,lungs, intestine in broiler birds naturally affected with colibacillosisin Gonda district of Uttar Pradesh. For this study, a totalnumber of 483 naturally dead broiler chickens from eight different private farms of Gonda district were collected during June2018 – May 2019. The birds were of different age group and of both sexes. Post mortem examination was conducted for all birdsand different internal organ were examined for the presence of gross lesions. After post mortem examination, the grosslysuspected samples were kept for further histopathological study. Grossly, liver was found as enlarged, congested and coveredwith thick yellow or white sero-fibrinous covering. Heart was also covered with thick yellow or white sero-fibrinous covering.In intestine, haemorrhages, congestion and oedematous swelling were noted.Microscopically, the liver of the infected birdsrevealed extensive haemorrhages, necrosis of hepatic cells and thickening of liver capsule, cellular infiltration and fattychanges. Congestion, severe necrosis of villi and intestinal gland and cellular infiltration were noted in intestine. Heartrevealed congestion, cellular infiltration, presence of thrombus and thick pericardium. Congestion, thrombus, oedema andemphysematous changes were also noted in the lungs.