Pathology of respiratory disease complex (RDC) in poultry- A field study

M. Lakshman
Department of Pathology, College of Veterinary Science,
Acharya N.G. Ranga Agricultural University, Rajendranagar, Hyderabad - 500030

The superior germplasm of intensely reared birds intended for increased production have made them to vulnerable to respiratory diseases complex (RDC), which is one of the most common and complex syndrome surfacing too often in the field. The present study revealed that the RDC syndrome has multiple etiological agents. Like bacteria (E.coli, Pasturella), virus (Mareks, Adenovirus), fungal (Aspergillosis) and altered husbandry practices. The gross pathology observed in 141positve birds out of 763 necropsied with 18.50 percent in Karimnagar district of Andhra Pradesh, India during 1996-99 (3 years period). The mortality was recorded as 18.42% in 0-8 weeks followed by 14.88% in 9-18 weeks and 27.18% in above 19 weeks age groups. Among 141 positive birds 36 have shown the inflammatory lesions in trachea with the overall incidence rates categorized as acute (13.48%), chronic (9.22%) catarrhal (1.42%), hypertrophy of mucosal glands (0.71%) and metaplasia of mucosa (0.71%). About 85 birds revealed lesions in the lungs manifested as congestion & edema (12.77%), acute interstitial pneumonia (15.60%), chronic interstitial pneumonia (13.48%), bronchopneumonia (12.78%), mycotic (2.84%), mareks (1.42%) and adenocarcinoma (1.42%). Twenty (20) birds have shown the lesions in air sacs, which were acute (10.64%) and chronic (3.55%) in nature along with lesions in trachea and lungs.

Source : IPSACON-2005

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