Official Journal of the College of Veterinary Medicine, University of Mosul
Abstract
The study was conducted to determine the percentages of different respiratory tract lesions in Broiler chickens offered to Bab-Singer veterinary clinic during the period 1/5/2007 to 1/7/2007. Gross and microscopic lesions of these chicks were examined according to Bird's age. The results showed that a significantly higher percentage respiratory tract infections were occurred during their 1st, 4th, 5th, 6th and 7th weeks of age, being 11.11% 13.89%, 16.67%, 16.67% and 16.67% respectively. The gross lesions at their first week of age were characterized by congestion of trachea and lung, while that of the 4th, 5th, 6th and 7th weeks were characterized by sever congestion and mucous accumulation in the trachea with sever congestion, necrosis and hepatization of the lung. The histopathological lesions were characterized by sloughing of the tracheal cilia with emphysema and congestion of the lung at the first week of the age and in the 4th, 5th, 6th and 7th weeks which characterized by sloughing of tracheal cilia with hyperplasia of epithelial cell with congestion, necrosis and inflammatory cells infiltration in lung tissue.
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