الفهرس 
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Abstract
The study was carried out at the farm of Aninal Product.n Departnent, Faculty of Jg.rioulture, Assiut University, L1P
822 pu1Lets representing four genotypes (DN, RIR, DNXRIR, d.RIRDN), each of which was represented by three successive ohes (Maeh,4’ii, and May). The object of this work was to aluate egg production performance of the DN, RIR,d their saes wider Upper Egypt conditions. The traits stu.died were tility and hatchability (using 7200 eggs on three suooess- veatohes during March, April,ancl May), Sexual maturity, egg eld, intensity, pauses, persistency, molt, egg quality , onents and chemical composition (monthly throughout one ar of laying), viability throughout the laying season and cod constituents having a relationship with immunological er of the bird (blood serum proteins and vitamin “0”).
The results led to the following conclusions:
Pertiity and hat ohsbil4r:
ja Fertiliti:
1—The DN id higher fertility than both RIR and its
F
ecsses (83.5, 72.8, 82.1, arid 81.4% in the DN,RIR,
DNXRIR, and RIRXDN, respectively). The differences between the RIR and the D11 wora statistically higji1r significant.