The prevention of e. coli infection in broilers by unisg antimicrobial feed additives

In this study, seven hundred and forty five either diseased or freshlydead chickens were collected from one hundred and thirty-sex broilerand balady flocks. from different localities at Sharkia province duringtwo years of investigation. The collected birds were examined in healthresearch institute zagazig.Total of 340 bacterial isolates could be isolated from exanimatebirds and identified into 135 strain E. coli; 42 strains klebsiella; 38strains shigella; 36strains proteus; 28 strains salmonella; 19 strainsciterobacter; 17 strains staphylococcus aureus; 25 strains Pseudomonasaeruginosa. Eighty one out of 135 strains of E.coli could be identifiedserologically into 2 strains (0111); 5 strains (08); 12strains (02);5strains (0164); 6 strains (0113); 10 strains (128); 3 strains (0136); 8strains (026); 7 strains (0124); 4 strains (055); 5 strains (0101);9strains (086); 2 strains (03); 3strains (044); while the remaining could not be identified.The clinical sings and macropathological finding were varied according to the type of treatment and route of inoculation.Antibiogram of isolated strain to different antimicrobial agent revealedthat the majority of the isolates were sensitive to Enrofloxacin ;fluemoquin ; colistin; f1orofincol ; Nalidixic acid; gentamydn; avitrel;flavomycin; nitrofuranton; refampcin; oxytetracyclin and erythromycin