In–vitro effect of some antibacterial drugs on isolated bacterial species causing diarrhea in calves in Kafer el-sheikh governorate

الملخص EN

A total of 50 Friesian calves,5-60day old with a history of sever diarrhea were subjected for some bacteriological studies to achieve an etiological diagnosis and trials of treatment.

So, Faecal samples were collected from the rectum of diarrhoeic calves for bacteriological examination.

The bacteriological examination, proved that bacteria was the main cause of these cases as 84 % of samples were bacteriologically positive and E.

coli was the most predominant pathogen (47.5%) either alone or in combination with other bacteria which isolated in a lower incidence.

Klebsiella,Pseudomonus, Proteus vulgaris,Citrobacter and salmonella were isolated at incedence of (6%),(10%),(8%) (8%)and (14%) respectively.

Also, 90.9 % of isolated E.coli strains is Enterotoxigenic positive . In–vitro sensitivity tests showed that enrofloxacine, gentamycin were the most effective antibacterial drugs .

On the other hand, oxytetracycline and penicillin had the lowest effect .