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This paper describes the incidence of poultry diseases and disease conditions recorded at the Veterinary Investigation Centre, Welisara, during the period 1975 t o 1979. I t was observed that the incidence of diseases like Pullorurn Disease, Chronic Respiratory Disease, Fowl Typhoid and Encephalomalac~a. declined. Conditions such as Coccidiosis, Chills, Ascaridiasis, Pneumonia, Enteritis, Colibacillosis, and Visceral Gout had variable incidence throughout the period. Incidence of Lymphoid Leucosis, Marek's Disease, Ranikhet Disease, Omphalitis, Infectious Coryza, Aspergillosis and Salt Poisoning were steadily increasing.

A study of incidence of poultry diseases and disease conditions causing mortality in Colombo region