This study was carried out in an attempt to improve Japanese quail productivity under north Sinai conditions using feed restriction technique. A total number of 600 one-week-old unsexed Japanese quail (Coturnix coturnix japonica) were divided into five treatments, each contained three replicates, of 40 birds per replicate. The experimental treatments are: T1, birds fed 100% of daily feed intake requirements; T2, birds fed 90% of daily feed intake requirements; T3, birds fed 80% of daily feed intake requirements; T4, birds fed 70% of daily feed intake requirements and T5, birds fed 60% of daily feed intake requirements .Weekly live body weight, puberty day and carcass measurements (carcass weight, ovary weight, oviduct weight, oviduct length) were recorded to the nearest 0.1 gm. The results showed that, feed restriction linearly reduced body weight gain. It was noticed that feed restriction improved (P<0.05) feed conversion. While, these improvements were not significant (P>0.05) at periods 1 to 2, 2 to 3 and 4 to 5 weeks of age, but were significant (P<0.05) at periods 3 to 4, 5 to 6 and 1 to 6 weeks. Feed restriction reduced (P<0.05) (weight or percentage) of reproductive organs (ovary and oviduct). Total costs tended to decrease with increasing feed restriction.  On the other hand, net revenue, economical efficiency and relative economic efficiency tended to increase by increasing restriction compared with the control.