الفهرس 
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Abstract
This work aimed to evaluate the effects of dietary calcium (0.65, 0.8 and 0.95%) during growing period and (2, 2.5 and 3%) during laying period with three levels of vitamin D3 (2000, 3000 and 4000 IU/kg diet) during growing and laying periods on growth performance, feed efficiency, some carcass traits, economical efficiency, egg weight, egg mass, egg number, egg quality traits and fertility and hatchability percentages. Obtained results can be summarized as the following:- Growing experimental: The different levels of dietary calcium did not affect significantly weight gain, feed intake and feed conversion at 2-4 wks of age in spite of, birds received 0.65% calcium in diet had the best value (2.38) of feed conversion. No significant differences in any carcass traits studied were observed among treatment groups due to dietary calcium levels. The different levels of vitamin D3 did not affect significantly weight gain, live body weight, feed intake and feed conversion during the different experimental periods except feed conversion at 2-4 weeks of age, whereas chicks fed diet of 3000 IU/kg vit. D3 gave the worest feed conversion. Also, vitamin D3 supplementation or their interaction with calcium levels did not affect significantly in any of carcass traits studied. - Laying experimental. Calcium levels did not affect feed intake, feed conversion, egg weight, egg number, egg mass and egg production percentage except egg weight, egg number and egg mass during 8-20 weeks of age and egg weight at 8- 12 weeks of age, which differed significantly due to dietary treatment with calcium. Calcium level did not affect any of egg quality traits during the different experimental periods, except egg shape index during 8-12 weeks of age and egg shell thickness during 16-20 weeks of age, which differed significantly in response to dietary treatment of calcium. Calcium did not affect significantly hatchability and fertility percentages during all experimental periods except fertility percentage during 9-14 weeks of age, which differed significantly due to the treatment. Vitamin D3 levels did not affect significantly any of feed intake, feed conversion, egg weight, egg number, egg mass, egg quality traits during all experimental periods except feed intake, egg number, egg mass and egg weight during 12-16 weeks of age. Also, egg shape index during (8-12 and 8-20 weeks of age), shell thickness during (8-12 weeks of age) and yolk height (8-20 weeks of age) which differed significantly. Vitamin D3 levels did not have any significant effects during all experimental periods on fertility and hatchability percentage, except fertility percentage during (9-20 weeks of age), since quails fed diet contained 4000 IU vit. D3 gave the highest value of fertility percentage as compared with other levels during this age.