“ETIO-PATHOMORPHOLOGICAL STUDIES ON RESPIRATORY TRACT AFFECTIONS OF BROILERS WITH SPECIAL REFERENCE TO ESCHERICHIA COLI”
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Date
2021-12-12
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Sher-e-Kashmir University of Agricultural Sciences & Technology, Jammu (J&K)
Abstract
Etio-pathomorphology of respiratory tract infections of broiler chickens in and around Jammu was determined. 150 flocks from different localities in Jammu were surveyed which included 55 organised and 95 unorganised poultry farms. 19 (34.5%) organized farms and 30 (31.57%) unorganised farms showed presence of a disease with respiratory involvement but E. coli was isolated from 17 organised (89.47%) and 23 unorganised (71.6%) farms. In nutshell, 32.6% of surveyed farms had respiratory tract infection in which 81.6% had an E. coli involvement. 30% and 31.35% of birds in organized and unorganized farms were found to be affected with E. coli infection. In the monsoon season, 24.99%, in the post monsoon 12.36%, in winter season, 49.99% and in summer season, 12.65% cases by E. coli were reported. Lungs were involved in 61.04% cases, 41.13% cases showed tracheal involvement, whereas 84.20% of cases showed air sac abnormalities. Gross lesions in lungs were congestion, consolidation, nodules and fibrin on lung surface. Consolidation, nodules and fibrin on the surface of lungs were recorded in 19.8%, 8.87% and 23.76% cases.
Microscopically, congestion, haemorrhage, edema, necrotizing pneumonia and serofibrinous pneumonia seen in 75.18%, 36.52%, 79.43%, 10.28% and 13.12% lungs respectively. 85.26% tracheal samples were congested, haemorrhage was seen in 17.90% samples, 53.69% samples had exudate and caseous plug was seen in 13.79% samples. Grossly, a total of 389 air sacs were found to be thickened appearing wet, hazy or cloudy. The thickening was mild, moderate and severe in 26.48%, 40.36% 33.16% cases respectively. Among the grossly thickened airsacs, 184 showed suppurative 47.3% and 52.70% had fibrinous inflammation.