الفهرس 
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Abstract
The present thesis was conducted to evaluate through a controlled
vaccination study with artificial challenge the protective value of a
prepared Clostridium perfringens type ”A” and type ”C” toxoid vaccine
in conferring protective immunity against necrotic enteritis (NE) in
breeder chickens and their progeny. The protective value of the prepared
vaccine was assessed by measuring antibody titers in sera of vaccinated
breeders after vaccination and post challenge by ELISA test and by
scoring lesion scores after challenge, while in progenyone
day oldantibody
titer levels and body weight and different interval were
evaluated. Result of this study revealed the opportunities of controlling
NE in poultry farms by vaccination. This result revealed that better
resultsas
measured by lesion scorewas
found in group of breeders had taken two doses of the prepared vaccine, while the best body weight gain
was found in broiler derived from breeders taken two doses of prepared
vaccine.