Department of Veterinary Microbiology, Veterinary College and Research Institute, Namakkal-637 002, Tamilnadu, India.
An attempt was made to analyze the influence of season on the mortality pattern of poultry in Namakkal belt, where about 30 million layer type of chickens and one million broiler type of chickens are reared in approximately 900 farms. The disease diagnosis was based on history, gross and microscopic lesions and isolaton and other diagnostic tests. The data analysed were obtained for three years from 2002 to 2004. Occurrence of Newcastle disease (15.07%, 14.22% and 17.98%) was higher in winter and rainy seasons than other diseases. Incidence of chronic respiratoy disease and colibacillosis was high among bacterial disease and there was no influence of seaeon on their occurrence. Occurrence of gangrenous dermatitis was higher (10.22%) in winter season than in rainy season (2.88%). Incidence of necrotic enteritis was high in winter (2.53%) and rainy season (1.84%) as compared to summer season. Though prevalence of coccidiosis in young and deep-litter reared birds was high, it was not uncommon in birds that were adult and grown in cage system.
Poultry, Diseases, Season, Occurrence, Influence
