E. Coli

Seven out of eleven (63.63%) E.coli isolates from layers were
sensitive to ampicillin. Comparable results were obtained by Abd-El-
Mawla (1998) who recorded moderate sensitivity percentage 50% for
ampicillin against E.coli isolates. Higher percentages 89.6% and 96.7%
were obtained by Gundogan et al.,(2006) and Khoshkhoo and
Peighambari (2005) respectively, meanwhile other studies on E.coli of
poultry showed that the resistance of isolates to ampicillin were 82%
and 74.24% as recorded by Mishra et al.,(2002) and Hui and Das
(2000) respectively.
Six out of eleven(54.54%) E.coli isolates from layers were
sensitive to gentamycin. This result agreed with the result obtained by
El-Ghamdi et al.,(1999) who compared antibiotic resistant E.coli
isolates to ampicillin, chloramphenicol, gentamycin, spectinomycin,
tetracyclin , trimethoprime spectinomycin, tetracyclin and sulpha-
methazole and found it ranged from 57% to 99.1%.
Seven out of eleven (63.63%) E.coli isolates from layers were
sensitive to sulphamethazole/ trimethoprime. This result is nearest to
the result of El-Sayed et al.,(2001) who stated that sulphamethazole
/trimethoprime resistance percentage was 73.3% and disagreed with
Blanco et al.,(1997) who stated that resistance percentage was 67%.
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