الفهرس 
Introduction and aim of the workOnly 14 pages are availabe for public view
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Abstract
This study aimed to improving productive and reproductive performance of Sinai laying hens and hatching traits, it included two experiments: The first experiment was conducted to investigate the effect of dietary spirulina and canthaxanthin supplementation to on productive and reproductive performance as well as subsequent growth and physiological performance of hatched chicks. A total of 150 hens and 15 cocks at 48 weeks old were divided into five experimental groups (30 hens +3cocks each) then arranged as follow the first group served as a control group and fed a basal diet without supplementation; the 2th and 3rd groups fed the basal diet supplemented with spirulina by 0.6 and 0.8 g/kg diet, respectively, while the 4th and 5th groups were fed the basal diet supplemented with canthaxanthin by 6 and 8 mg/kg diet, respectively for 12 weeks from 48 to 60 weeks-old. Obtained results showed that dietary spirulina and canthaxanthin supplementation by 0.8 g SP/kg or 8.0 mg CX/kg diet improved productive (laying production, egg weight feed conversion ratio) and reproductive (semen quality, fertility and hatchability , %) performance as well as subsequent growth and physiological performance of hatched chicks .The second experiment was conducted to investigate the effect of in-ovo injection Sinai hen’s eggs with spirulina and canthaxanthin at the 14th day of incubation period on hatching traits and subsequent growth and physiological performance of hatched chicks up to 28 days. A 540 hatching Sinai eggs were distributed into 6 groups and incubated at the 14th day of incubation. The groups were organized as follow: the first group as a negative control without injection while the other groups were injected with sterile distilled water (0.25 ml/egg) alone as a positive control (the 2th group) or with spirulina for 3th and 4th groups with 2.5 and 5.0 mg/egg and canthaxanthin for 5th and 6th groups with 0.025 and 0.050 mg/egg, respectively. The obtained results indicated that the highest value of hatchability (%) of fertile eggs was achieved by injected eggs with 0.050 mg canthaxanthin /egg followed by in-ovo injection with 2.5 mg spirulina /egg in comparison with the positive and negative control groups. Chicks produced from the eggs injected with 0.050 mg canthaxanthin / egg recorded a significant improvement in body weight gain from hatch up to 28 days of age than other injected groups and negative control.Recommendation: dietary spirulina and canthaxanthin supplementation by 0.8 g SP/kg or 8.0 mg CX/kg diet could be used to improve productive and reproductive performance for laying hens as well as subsequent growth and physiological performance of hatched chicks. Also, In-ovo injection eggs with 2.5 mg spirulina or 0.05 mg canthaxanthin /egg at 14th day of incubation period could be used to improve hatching traits and subsequent growth performance of hatched chicks.