الفهرس 
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Abstract
The objective of our trails was to investigate the role of graded dietary levels of two probiotic strains (Bacillus toyonensis; BT and Bifidobacterium bifidum; BB) on growth rate, carcass traits, physiological, histological and microbial aspects of growing Japanese quail and on laying Japanese quail’s performance, egg quality, fertility and hatchability, blood biochemical parameters and microbial aspects. Two experiments were conducted on growing and laying Japanese quail were randomly allocated into ten groups with eight replicates (growing trail) and nine replicates (laying trail) each. The 1st group served as a control and fed the basal diet without supplement while the 2nd, 3rd, 4th and 5th groups received the control diet supplemented with 0.05, 0.075, 0.10 and 0.125% BT, respectively. The 6th group fed control diet plus 0.10% BB while the remaining groups (7th to 10th) received the basal diet incorporated with the same previous doses of BT plus 0.05% BB. Results obtained concluded that dietary supplementation of BT with or without BB were found to be beneficial for growth performance, digestive enzyme activities, blood cholesterols and antioxidant status of growing Japanese quail. Results obtained concluded that dietary supplementation of B1 with or without B2 was found to be beneficial for productive and reproductive performance, digestive enzyme activities, reduce the harmful bacteria and have a good health of laying Japanese quail Our findings could be recommended to apply T6 (basal diet + 0.10% B2), T9 (basal diet + 0.10% B1 + 0.05% B2) and T4 (basal diet + 0.10 % B1) levels for the best results.