PATHOLOGYCAL INVESTIGATION OF AVIAN MYCOPLASMOSIS IN SONALI AT JOYPURHAT DISTRICT

Abstract

The study was designed to investigate the pathological conditions of Avian Mycoplasmosis in the small scale commercial Sonali farms at different region in Joypurhat district. The duration of experiment was 6 month from January to July 2015. The objectives of the study were clinical signs, gross lesion, microscopic lesion, and the prevalence of the diseases. Different organ mainly lung, trachea, heart, & air sac were collected, preserved, and processed for histopathological examination. The total of 500 of the 290 affected sonali birds were examined as mycoplasmosis. Agewise prevalence was 60-67% and season wise prevalence was 55%. The clinical signs were coughing, sneezing, rales, ocular and nasal discharge, dyspnea with typical voices. At necropsy catarrhal exudates in nasal passages, catarrhal and foamy exudates in the trachea, congestion and hemorrhage in the trachea, dark red color appearance in lung. Air sacs were thickened, heart covered with fibrinopurulent, liver was congested and show haemorrhages. Histological lesions in the trachea, mononuclear cellular infiltration in the mucosa and sloughing off mucosal lining were found. Mucosal glandular hyperplasia and lymphoid follicular reaction with connective tissue were found in trachea. Infiltration of mononuclear cell were found in lung parenchyma. Congestion and accumulation of fibrin also found in lung parenchyma.