الفهرس 
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Abstract
The results of monitoring of the causes of mortality (and / or) decrease egg production in broiler breeder and layer flocks in different localities in Egypt (Alex, Behera, Dakhlia,Giza, Monofya, Sharqia and Qaliobia) from October 2014 to September 2016. on 1.3 millions layer (in 25 flocks) and 890000 broiler breeder (in 18 flocks ). showed that co infection was a prevailing phenomenon and superior to single infection in breeders while the opposite in layers. Co infection in breeders was 61.2% and 38.8% of single infection while in layers Co infection was 36.0% and single infection was 64.0%. It was more prevalent in breeders in single infection was infectious bronchitis virus and in layers influenza H5 was the highest. It is mentioning that infectious bronchitis virus is a common factor in coinfection in breeders while Influenza H9 was the commenest in layers.
of Veterinary Medicine , Cairo University