الفهرس 
RATIONALE AND OBJECTIVES
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Abstract
The experimental work of this study was conducted at the Poultry Research Farm, Faculty of Agriculture, Assiut University. The work was composed of five experiments: No.1. to evaluate the impact of early in ovo injection of some water-soluble vitamins (i.e. B2, B6 and folic acid) in broiler-breeders eggs at 7th day of incubation period on embryonic development and hatchability; No.2. to assess the effect of late in ovo injection of some water-soluble vitamins (i.e. B2, B6 and folic acid) in broiler-breeders eggs at 17th day of incubation period on hatchability, post-hatch growth performance and carcass criteria; No.3. to determine the impact of early in ovo injection of some fat-soluble vitamins (i.e. A, E, and D3) in broiler-breeders eggs at 7th day of incubation period on hatchability, post-hatch growth performance and carcass criteria; No.4. to investigate the effects of late in ovo injection of some fat-soluble vitamins (i.e. A, E and D3) in broiler-breeders eggs at 17th day of incubation period on embryonic development and hatchability; No.5. to assess the impact of semi-late in ovo injection of some water and fat-soluble vitamins (i.e. B2, B6, folic acid, A, E, and D3) in broiler-breeder eggs at 14th day of incubation period on hatchability. Injection procedure was done similarly for all experiments. All eggs were cleaned with 70% ethanol to disinfect the shell surface and the injection was directed to the amnion fluid using a 25 gauge, 1inch needle and automatic syringe. Hatched chicks from all experiments were exposed to the same managerial and hygienic conditions. Hatchability percentage was evaluated in all experiments. Live body weight (LBW), body weight gain (BWG), feed consumption (FC), feed conversion ratio (FCR) were estimated in experiments 2 and 3, for the whole experimental period (6 weeks). At the end of experiments 2 and 3, six birds from each group were sacrificed for evaluating different carcass traits. The results obtained can be summarized as follows:
1. Experiment One : The results revealed complete loss of hatchability. All embryos in all treatments injected with distilled water or different water-soluble vitamins at the 7th day of incubation period died at different embryonic stages. At the same time, HP of the negative control group was 82.5%.
2. Experiment Two: 2.1 Embryonic development and hatchability: The results revealed a decrease in numbers of chicks hatched from all treatments injected with different water-soluble vitamins (61-68 %) compared to the negative control group (83%). It is worthy to mention that the higher HP rather than the positive control (sham control) or the injected with different water-soluble vitamins groups was recorded for the eggs injected with vitamin B2. Whileas, the lowest HP was recorded for the treatment injected with B6.