PATHOLOGICAL AND MOLECULAR STUDIES ON RESPIRATORY DISEASES IN CHICKEN WITH SPECIAL REFERENCE ON INFECTIOUS BRONCHITIS AND INFECTIOUS LARYNGOTRACHEITIS
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Date
2021
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TANUVAS, CHENNAI
Abstract
The present study was conducted to understand the pathotype and genotype of viral strains of Infectious laryngotracheitis (ILT) and Infectious bronchitis (IB) that caused high morbidity and mortality in the poultry flocks and involved in the disease outbreaks, by pathological and molecular approaches such as immunohistochemistry, genome sequencing and ultrastructural studies. Keeping in view, the paucity of data on the detection and distribution of ILT and IB viral antigens in Tamilnadu, the farms in and around Namakkal, Tiruchirapalli, Pudukkottai and Thanjavur districts of Tamil Nadu with suspected respiratory diseases were selected for this study. The data pertaining to the breed and strain of chicken, flock strength, age, method of rearing, production performance and clinical signs manifested were recorded.
The overall incidence of respiratory diseases recorded in the present study was 57.67 %. The incidence of ILT at 34.72 % and IB at 22.22 % was recorded among the 720 birds examined. Concurrent infection of ILT with fowl cholera and chronic respiratory disease and concurrent infection of IB with ND, infectious coryza and colibacillosis was recorded. The incidence of ILT was recorded in all type of chicken with the highest incidence of ILT recorded in commercial layers (58.00 %).