الفهرس 
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Abstract
A total of 1460 newly born calves were examined out of which 431 calves (29.5%) were diarrheic. The study was aimed to investigate the prevalence of bacterial causes of enteritis in new born calves reared in six dairy farms in Sharkia and Ismailia provinces. In which a total 431 fecal samples were collected from diarrheic calves aged from 1 day to three months and examined for presence of enteric bacteria. The most common clinical signs of affected new born calves were fever, different degree of dehydration, emaciation and congestion of mucous membranes. Diarrhea varied from profuse watery to semi fluid or soft feces and ranged in color from whitish or yellowish to greenish diarrhea ad in some cases tinged with blood and may sometimes contain mucous. The overall prevalence of diarrhea in studied farms during period of investigation was 29.5%. The highest prevalence rate recorded in farm I and farm V, followed by farm VI and farm III; and lower prevalence was noted in farm II and farm IV. The prevalence rate was higher in buffalo calves than cow calves. The highest prevalence was recorded in winter and in the 2nd age group (7-14 days). Different types of enteric bacteria were isolated from diarrheic calves and the most important types were Escherichia coli, Salmonella and Clostridium perfringens.