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Impacts of different stocking densities and feed restriction on egg production and quality and blood biochemicals of laying Japanese quail ( Coturnix coturnix Japonica ) were studied. A total number of 360 adult Japanese quails were used in an experiment, including two stocking densities (300 and 200 cm 2 /bird) and four feed restriction levels ( ad libitum , 25, 30 and 35 g/day/bird). As a result of this study, feed restriction (30 g/bird/day) enhanced most of egg production traits and improved hatchability. Albumen and egg shell thickness showed the highest values when birds fed  ad libitum  and 35 g/bird/day. Blood total protein, albumin, Aspartate Aminotransferase (AST) and cholesterol were higher in quails housed at 200 cm 2 /bird than those kept at 300 cm 2 /bird. The highest values of blood total protein, albumin, AST and cholesterol were found in quails fed  ad libitum . Activity of superoxide dismutase was the highest estimate when birds stocked at 300 cm 2 /bird and fed  ad libitum  or 25 g/day. Conclusively, decreasing space per bird had a negative effect on performance. Feed restriction can achieve a better feed conversion ratio (FCR).

Restricted feeding could enhance feed conversion ratio and egg quality of laying Japanese quail kept under different stocking densities