Pathological investigation of Newcastle disease in layers at Ramu Upazilla of Cox’s Bazar

Abstract

Newcastle disease (ND) is a virulent infectious and contagious disease of domestic poultry and other bird species caused by virulent Newcastle disease virus (NDV). This study was conducted to know the partial prevalence of Newcastle Disease (ND) cases in Upazilla Veterinary Hospital, Ramu and investigation of pathological changes in ND suspected layer birds in commercial rearing platform. All the presented dead and sick birds were examined in necropsy and history of birds were recorded in questionnaire. ND suspected layer birds were sampled for histopathology. Over the study period twenty ND suspected cases were included in this study. In necropsy, observed gross lesions include liver hemorrhage 15 (75%), liver congestion 17(85%), tracheal hemorrhage 17(85%), tracheal congestion 5 (25%), pin point hemorrhage in proventriculus 13(65%), hemorrhage in cecal tonsil 17 (85%) and hemorrhage in the base of the heart 3 (15%) in ND suspected cases. In microscopy, hemorrhage in cecal tonsil 17 (83%), hemorrhage in tip of gland of proventriculus 4 (22%), hemorrhage in liver 13 (72%) were observed. Congestion in heart and hemorrhage in lung were found to be 3 (17%) and 4 (22%), respectively. Precise diagnosis and timely management can reduce the risk ND pretended mortality in commercial poultry farming in Bangladesh.