PATHOLOGICAL INVESTIGATION OF AVIAN ASPERGILLOSIS IN COMMERCIAL BROILER CHICKEN AT CHITTAGONG DISTRICT
Date
2013-12
Authors
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Publisher
HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR.
Abstract
The present study was carried out to investigate the pathology of avian
aspergillosis in commercial broiler chickens at Chittagong district. A total of 912
sick and dead chickens were collected from 20 commercial broiler farms and
diagnosed for avian aspergillosis on the basis of clinical signs, symptoms and
postmortem findings. The suspected birds were collected for necropsy
examination and mycological culture. Gross lesions of multiple hard creamy to
yellow colored, circumscribe plaques throughout the lungs surface and
consolidated lung with necrotic areas were observed. Microscopically, the typical
nodules consisted of caseous necrotic center were present. Identified the
Aspergillus spp according to their color of colony growth on Potato Dextrose
Agar media. The overall incidence of avian aspergillosis was found 6.14%.
Among five upazilla, significantly (p<0.007) higher and lower incidence was
found in Patenga and Sitakunda that were 9.25% and 3.43% respectively. It was
observed that highest incidence (8.22%) in rainy and lowest (3.16%) in winter but
moderate (5.16%) in summer season. The disease was significantly (p<0.050)
higher (8.27%) in age between 6-10 days and lower (4.11%) in age between 0-5
days. It was also found that incidence of avian aspergillosis was significantly
(p<0.042) higher in flocks reared on sawdust litter (7.69%) as compared to rice
husk litter (3. 46%).
Description
Poultry farming is emerging as a strong agro-based industry from the backyard
poultry rearing system to commercial intensive rearing systems during the last
two decades in Bangladesh. This rapid growth of poultry industry to supplement
their income with the fast development of poultry industry, the occurrence of
diseases has increased many folds which remain the major problem affecting its
economy as a results disease play a vital role to better understand the status and
pattern of diseases (Islaia et al., 2003; Saleque ef al., 2003 and Uddin et al.,
2011).
Keywords
AVIAN ASPERGILLOSIS IN COMMERCIAL BROILER CHICKEN, Geographical distribution, Morbidity and mortality