الفهرس 
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Abstract
Probiotics include viable microbial and microbial fermentation products which are beneficial to decrease the undesirable microflora population in the gastrointestinal tract of chicks and build-up resistance against diseases by stimulating the immune system.
The fundamental goal of present study carried out to evaluate the effect of probiotics against challenge by E.coli O78:K80 for experimental infected chicks of both treated and untreated control group, determination of phagocytic activity in broiler chicks obtained oral probiotics, studying the effect of probiotic on survival rate of broiler, Comparison between different probiotics.
Two hundred, one day old Avian 48 chicks were used and divided into 4 sub-groups.
The results of Phagocytic percentages, Indices and Survival percentages obtained for groups treated with probiotics were higher than non-treated groups. Also, the bacterial count in liver, caecal homogenates and heart blood were lower than non-treated groups.