الفهرس 
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Abstract
The growing need for animal protein drowned the attention towards poultry as apopular source and one of the short period means of producing animal protein. Tomaximize this animal protein production, the genetic of selection can play animportant role in increasing body weight of the domestic fowl. The added nature ofgenetic variation for growth has resulted in considerable improvement in body weightof the domestic fowl as a result of individual phenotypic selection. Similarly, Marks
(1978 a) and Nestor et al. (1982) have demonstrated that Japanese quail also showa marked response to selection for increased body weight. In addition, the selectionexperiments with Japanese quail concentrating body weight have shown realizedheritabilities generally above 0.30. Also Chambers (1990) has shown that genetic prameters for growth traits in japanese quail are remarkably similar to those forgrowth traits in chickens. Furthermore, selection for body weight can greatly affect
another traits such as carcass weight or egg production.The main purpose of this study was to :1- Estimate direct response to selection.