الفهرس 
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Abstract
Enzymes are special proteins that catalyze the digestibility of a
wide range of feed components such as fiber, phytate, protein in nonruminants
diets. Fiber-degrading enzymes were used to break down
specially non-starch polysaccharides (NSP), which are large polymers,
to smaller polymers to alleviate their anti-nutritive activities. A total of
160, one day old commercial Cobb broiler chicks were divided into 8
equal groups in a 6 weeks feeding trial to investigate the effect of
addition of the feed Enzymes (HerizymR), with or without
antibacterial or anticoccidial drugs, on enhancing the feed efficiency
and controlling the hazardous effect of Salmonella infection or
Eimeria infestation of broiler chicks. The obtained results indicated
that dietary enzymes addition to broiler ration exposed to Salmonella
infection or Eimeria infestation improved growth performance,
decreased bacterial count and Eimeria oocyte shedding, and
enhanced Lactobacillus count. Antibiotic and anticoccidial with
enzyme addition had good recovery effect on histopathological
finding in liver and intestine of broilers.
It could be concluded that enzyme dietary addition, with or
without antibacterial and anticoccidial drugs, ameliorated the
hazardous effect of Salmonella infection or Eimeria infestation on
performance and on histopathological finding in liver and intestine of
broilers.