الفهرس 
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Abstract
The present work is concerned with the study of the effect of calcium, vitamin d3 and vitamin c on egg production and egg shell quality. 96 hens are studied. Limestone, oyster shells and bone meal are the sources of calcium added to the rations. Values of egg number and feed efficiency are in the same order descendingly. Egg number , egg efficiency and egg quality increase as calcium level increases in diet from 1.5% to 3% .limestone rations give the highest egg weight followed by bone meal and oyster shells rations. Oyster shells rations give the best shell quality measures. As dietary phosphorus level increases from 0.6% to 1.4% , inFerior characteristics for egg production and shell quality are observed. Vitamin c and vitamin addition improves egg number, egg weight, feed efficiency and maintains shell quality. No relationship is observed between shell thickness and porosity coeffIcient.