الفهرس 
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Abstract
There are bacterial causes of mortalities in broiler baby chicks in broiler poultry farms in dakahlea governorate. A total of 240 samples (105moribund chicks and 135 dead chicks) resembles different breeds (Avian, Cobb, Hubbard, Baladi and Saso) , different ages(1-7d.), different housing capacity (5.000:20.000) as well as different farm districts , these samples were collected during the experiment period (2012-2015). The isolated bacteria from these samples were identified by culture character, biochemical tests and serological identification. The predominant isolated bacteria were Salmonella (75%) as Three isolates of Salmonella enteritidis one isolate of Salmonella typhimurium, one isolate of Salmonella kentucky one isolate of Salmonella tamale followed by E. coli (25%) as two isolate of E. coli (O) group were identified. The isolated strains of Salmonella and E. coli were inoculated into susceptible one day old chicks by two routes (oral and I/p) routes. The results of clinical signs, PM lesions, histopathological lesions and performance profile of each subgroup revealed that chick mortalies with clinical signs and septicemic pictures were recorded in most inoculated groups except control group. Mortality rate was higher in (I/p) inoculation than (oral) inoculation. Histopathological lesions proved signs of severe congestion in liver, lung, and other tissue samples. Growth performance parameters proved that there were significantly lower feed intakes and mean body weight gain all over the experimentation period (four weeks) in all groups in comparison with control group.