الفهرس 
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Abstract
(Control of microorganisms on hatching eggshell surface requires an effective disinfectant to kill the pathogens without injury to the live chick embryo. The present experiment was carried out to study the effect of hatching egg sanitization time by different disinfectants on some hatchability parameters. A total of 600 broiler breeder fertile eggs from a commercial broiler strain (Saso) aged 35 wk were reared on a deep litter system at a private farm in Gharbiya Governorate, Egypt. All eggs were randomly divided into three treatment groups of 200 eggs each. The eggs in the first group were kept as a control without treatment. While, the eggs in the second and third groups were subdivided into equal four subgroups treated by Propolis 14%, Ethyl alcohol 70%, TH4 0.5% and Virkon S 0.5 %., respectively, which, they disinfected before 6hrs from egg laying in the second group and disinfected after 6hrs from egg laying in the third group. Results revealed that there was no significant difference in egg weight loss during egg storage period and hatch time in relation to time of egg disinfectants (before and after 6 hrs from egg laying) and among different disinfectants used. But, the hatchability % and TBC were reduced by using propolis 14% as egg disinfectant. On the other side, total embryonic mortality % and chick hatch weight were increased by application of propolis 14% as egg disinfectant in compared to other disinfectants used. In conclusion, the application of egg sanitization process immediately after egg laying was beneficial in lowering TBC. Using propolis 14% in the disinfection process reduced the egg weight loss and hatchability percent but increased the hatching chick weight and chick weight on day 7 of growing period).
Keywords: propolis; bacterial count; hatch time; hatchability; embryonic mortality.