الفهرس 
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Abstract
Clostridium perfringens is a bacterial pathogen causing severe economic losses through mortality and weight loss in broiler chickens. The present work aims to study the effect of Cl. perfringens infection on broiler chickens and compares between the effect of amoxicillin and / or organic acids on Cl. perfringens infection through the evaluation of hemogram, blood chemistry and immune response.
One hundred and sixty one-day old chicks were divided into eight equal groups. group (1): normal control, group (2): chickens administrated amoxicillin (15 mg/kg.b.wt.) from 25-29 days old, group (3): chickens administrated organic acids (1 ml /l water) from 1st day old till the end of the experiment , group (4): chickens administrated amoxicillin and organic acids from 25-29 days old, group (5): Clostridium perfringens type A (1.9×109 organism/ml) infected chickens at 19th days old 3 times orally day after day, group (6): Clostridium perfringens infected chickens and treated with amoxicillin (15 mg/kg.b.wt.) for 5 successive days, group (7): chickens administrated organic acids (1 ml /l water) then infected with Cl. perfringens and group (8): chickens infected with Cl. perfringens and treated with both amoxicillin and organic acids.