The result of hatchability percentage is consistent with other study[13]. The hatchability and embryonic mortality of fertile eggs were influenced by the type of injected substance and site of injection into the eggs. Exogenous VE injection around 14th day of incubation (critical time of fatty acid oxidation) may be beneficial in reducing the production of free radicals that cause a serious damage to the cellular membranes[4 and 18], and increase lipid utilization for energy production to improve hatchability[3]. Therefore, higher hatchability percentage after IOI of VE may be due to the improvement of the antioxidant status of the eggs[18], or protection effects of the VE against oxidation[19]. It is reported that higher body weight was obtained by IOI of VE due to the prevention of hydro peroxides impacts and more energy production by VE injected eggs which enhance the embryonic growth[3]. This is the opposite of the result of current study. It may be due to differences in VE usage dose.