الفهرس 
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Abstract
This study demonstrates the evaluation of the incidence od NE in broilers and layers according to each season of the year . Examined 120 dead chickens with signs and lesions of natural infection with NE revealed the isolation of C. Perfringens from positive chickens with incidence of 47.5% The incidence of NE was higher in autumn and summer than winter and spring in broiler while in layer it was higher in autumn and spring than winter and summer.