Author(s):

GK Singh, D Niyogi, KK Tripathi, N Joshi, A Vaish and Abhishek Mishra

Abstract: A study was carried out round the year from May 2015 to April 2016 to establish the pathomorphological changes in the broiler chickens due to spontaneous E. coli infection in Faizabad and Sultanpur districts of Uttar Pradesh. For this study a total number of 178 naturally dead broiler chickens from different private farms of Faizabad district and 151 naturally dead broiler chickens from Sultanpur district were collected throughout the year. The birds were of different age group and of both sexes. After post mortem examination, the grossly suspected samples were kept for further bacteriological study. Post mortem examination was conducted for all birds (178+151) and different internal organ were examined for the presence of gross lesions. The gross change of liver was found as enlarged, congested and covered with thick yellow/white serofibrinous covering. Haemorrhages, congestion and edematous swelling were noted in intestine. Heart was also covered with thick yellow/white serofibrinous covering. Among tested 178 and 151 samples from Faizabad and Sultanpur districts, 95 (53.37%) and 44 (29.13%) respectively were found to be suggestive of E.coli infection in bacteriological study. In histopathological study, the liver of the infected birds showed extensive haemorrahage, necrosis of hepatic cells and thickening of liver capsule, cellular infiltration and fatty changes. In intestine, there were congestion, severe necrosis of villi and intestinal gland, cellular infiltration and oedema of submucosa. Heart showed congestion, severe cellular infiltration, presence of thrombus and thick pericardium. Lungs showed congestion, thrombus and emphysematous changes in few cases. Spleen were congested and necrosed with thick splenic capsule.

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