الفهرس 
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Abstract
The present experimental work was carried out at the Poultry Research Laboratory belonging to Animal and Fish Production Department, Faculty of Agriculture (Saba Basha), Alexandria University. This study was undertaken during the period from June to august 2018 This study was investigated the effects of different levels of licorice and Tylosin on the productive and reproductive performance, egg quality, hematological indices, serum biochemistry, lipids profile and possibility of improving the immunity of laying Japanese quail. A total number of 180 Japanese quail birds (120 females and 60 males) at 9 weeks’ old were used. Quail were weighed individually, randomly distributed into five experimental groups, each group contained 36 birds (24 females and 12 males); each one was subdivided into four replicates with 9 birds (6 females and 3 males) in a complete randomized design. Quail were housed in wire laying cages, (2 females and 1 males); of an open house system throughout the experimental period which started at 9 weeks of age till 18 weeks of age.