الفهرس 
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Abstract
it could be concluded that application of eggs disinfection process at first day of incubation is beneficial in lowering TBC, TFC, and TCC and embryonic mortality and increase hatchablity %. On the other side, it did not affect hatching chick weight and chick performance after 1st week of hatching.
from these results, it could be recommended the following:
Hatchery sanitation reduced the bacterial load of egg and reduced the spread of Salmonella and E. coli.
Hatchery sanitation using Virkon S improved hatchability and reduced chick abnormalities.
Under this experiment, the most powerful hatchery disinfectant was virkon S followed by TH4 and H2O2.
Under this experiment, egg sanitation before incubation has no effect on
chick performance during the first week of life.
Disinfection of hatching eggs as soon as possible on the first day of incubation lower TBC, TFC, TCC and embryonic mortality and increase the hatchability % in comparison with disinfection of hatching eggs on the 7th day.