PATHOLOGY OF CARDIO-PULMONARY AND RENAL AFFECTIONS IN DUCKS AND SCREENING FOR ASSOCIATED VIRUSES
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Date
2022-02-25
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES POOKODE, WAYANAD
Abstract
The present study entitled “Pathology of cardio-pulmonary and renal
affections in ducks and screening for associated viruses focused on systematic
recording of gross and histopathological changes in heart lungs and kidneys and
screening for MDPV, DAdV-1 and ANV. A detailed post mortem examination of
119 duck carcasses was carried out, gross lesions noted and representative samples
were collected from heart, lungs and kidneys for histopathology and molecular
screening. Gross lung/airsac lesions were observed in 31.09 per cent carcasses and
the lesion varied from cloudy airsacs, nodules in air sacs, congestion, consolidation
and nodules in lungs. Microscopically lung showed varying degrees of
mononuclear cell infiltration and vascular changes. Gross lesions in heart were
observed in 20.16 per cent of duck carcasses and the lesion varied from deposition
of white material on pericardium, pale discolouration of cardiac muscles, rounding
of heart and ventricular hypertrophy. Microscopic lesions included fibrinous
pericarditis, myocardial degeneration, epicardial thickening, myocardial fibrosis,
microcapillary dilatation and myocardial hemorrhage. Gross lesions in kidneys
were congestion, deposition white material, atrophy and enlargement of kidneys.
Microscopic lesions in kidneys were associated with glomeruli, tubules,
interstitium and vascular changes. Sclerotic changes in kidneys were graded based
on extend of fibrous tissue proliferation in Masson trichrome stained sections.A
grading system for chronic changes in kidneys based on Masson trichrome staining
was carried out for the first time in birds. Grading of lung inflammatory lesions
were also made. Adult ducks reared under intensive system showed more chronic
changes compared to ducks reared in backyard system which showed more of acute
lesions.
Description
Submitted in partial fulfillment of the requirement for the degree of
MASTER OF VETERINARY SCIENCE in Veterinary Pathology