The present study aimed to improve the genetic potentialities of production traits in the Japanese quail through four generations of selec­tion by using the independent curling levels technique to develop line for egg production (L2), as well as, the control line (L1). Egg production traits including body weight and age at sexual maturity, number and weight of eggs until 90 days of age and feed conversion during 11-13 weeks of age were obtained in each generation. Moreover, the genetic and phenotypic parameters for the above traits were estimated in each generation. The main results and conclusions were; average egg number ranged between 33.83 to 37.14 eggs for L2 and 19.35 to 26.04 eggs for L1. The quails of the L2 had the approximately equal mean (2.48 to 2.64 g. feed / g. eggs) over the three generations with highly significant differences among all sources of variance studied. The differences among generations or lines were highly significant for body weight at sexual maturity, age at sexual maturity, egg number and egg weight until 90 days of age. The results showed a decrease in the mean of the egg number in the 3^rd generation than those of the base ones, while, L2 (se­lected fine for egg production) had higher mean of the egg production (35.19 eggs) than line L1 (23.93 eggs). The heritability estimates for egg production traits of L2 ranged from low (age at sexual maturity) to moderate (egg weight) and high (body weight at sexual maturity and egg number).