الفهرس 
Introduction
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Abstract
This study was planned to study the effect of some preincubation egg treatment on egg hatchability and chick performance. So, some trials were performed on hatching eggs:(1) Effect of storage time and temperature on hatchability. (a) Storage of hatching eggs for 7 days at 10<U+00BA>C and 18<U+00BA>C. (b) Storage of hatching eggs for 14 days at 10<U+00BA>C and 18<U+00BA>C. (2) Effect of prestorage fumigation on hatchability. (a) Storage of hatching eggs for 7 days at 10<U+00BA>C and 18<U+00BA>C. (b) Storage of hatching eggs for 14 days at 10<U+00BA>C and 18<U+00BA>C. (3) Effect of disinfectant and antibiotic treatment. (a) Spraying of eggs by Biosentry 904. (b) Dipping of eggs in gentamicine solution. (c) Injection of eggs with gentamicine solution. The chicks hatched from eggs stored at 10<U+00BA>C for 14 days had lower feed intake, heavier body weight, higher body gain and better feed conversion than those from eggs stored at 18<U+00BA>C for 7 days. While chicks hatched from fumigated eggs stored for 14 days at 10<U+00BA>C had lower feed intake, heavier body weight, higher body gain and better feed conversion than chicks hatched from fumigated eggs stored at 18<U+00BA>C for 7 days. chicks hatched from eggs dipped in gentamicine solution had lower feed intake, heavier body weight, higher body gain and better feed conversion compared with those hatched from gentamicine injection, Biosentry 904 spraying and control group. The study also discussed the importance of optimum storage conditions (storage time and temperature ) in order to have higher hatchability percentage, the importance of preincubation treatments to decrease bacterial contamination on egg shell with prevention of its invasion into the egg contents and reaching the highest performance of hatched chicks.