الفهرس 
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Abstract
The present study was carried out at the Department of Animal Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine, Alexandria University throughout the period from October 2016 to July 2017.
The experiment aimed to investigate the effects of different light colors on pre hatch performance of Japanese quail and Cobb500 broiler eggs as well as reproductive and growth performance of Japanese quails and Cobb500 broilers.
Studied traits:
1. Fertility and hatchability and embryonic mortalities percentages.
2. Egg weight loss during incubation period.
3. Age at sexual maturity of Japanese quails.
4. Egg production for 42 days after sexual maturity of Japanese quails.
5. Egg quality of Japanese quails.
6. Body weight was recorded weekly from hatch to five weeks of Japanese quails and cobb500 broilers.
7. Relative growth rate of Japanese quails and cobb500 broilers.
The main findings from this study can be summarized as the following:
• Scientific hatchability was significantly higher in Japanese quail eggs treated with Red and Green lights (91.53 and 89.90%) compared to those subjected to dark treatment (85.30 %). Also, scientific hatchability for Cobb500 broiler eggs was significantly higher in Red and Green light treatments (92.40 and 90.77%) than those subjected to dark treatment (85.40%).
• Red light treatment expressed lowest significant difference for early embryonic mortality percentages for Japanese quail and Cobb500 broiler eggs (23.57 and 26.07%). On the other hand, Dark treatment showed lowest significant difference for late embryonic mortality percentages (39.71%) for quail While, Green light showed lowest significant difference for late embryonic mortality percentages Cobb500 broiler eggs (35.08 %).
• Quail eggs incubated in Dark treatment recorded the highest total egg weight loss percentage (10.75%) while the lowest total egg weight loss percentage was recorded for quail eggs incubated in Green light (7.21%). On the other hand, Cobb500 broiler eggs incubated in Red light recorded the highest total egg weight loss percentage (12.33 %) while the lowest total egg weight loss percentage was recorded for eggs incubated in Green light (8.69 %).
• Japanese quail reared under RR and RW light showed the highest significant overall body weight (243.28 and 244.41 g) and total relative growth rate (184.50 and 185.21%) compared to birds reared under GG and GW light (234.54 and 236.76 g) (182.48 and 182.63%). Moreover, sex effect was evident on body weight. Females were heavier than males in all light treatments.
• Light effect showed significant differences among body weight and relative growth rate of Cobb500 broilers where the highest overall body weight and relative growth rate were observed in birds reared under GG light (2064.70 g and 195.47%) while the lowest body weight and relative growth rate were recorded for birds reared under RR light (1557.16 g and 194.10 %) as well as sex effect was evident on body weight. Males were heavier than females in all light treatments.
• The RR and RW light treatments induced sexual maturity of Japanese quail (39.34 and 40.04 d) earlier than GW and DW treatments (44.81 and 44.87 d) while GG treatment delayed sexual maturity (48.45 d).
• The highest total HDEP percentage recorded for RR light treated birds (79.76%) and the lowest HDEP percentage recorded for GG light treated birds (66.16%).
• Significant differences for yolk plus albumin percentage were observed for GG, GW, RR, RW and DW light treatments (82.99, 83.34, 83.34, 82.98 and 78.92 %, respectively). GG light treated eggs showed the highest significant Yolk index (0.52) while the lowest Yolk index recorded for RW and DW light treated eggs (0.45 and 0.46). Haugh Unit value was ranged from (97.59 to 93.02) among five light treatments GG, GW, RR , RW and DW , the highest significant value recorded for GW light treatment while the lowest significant value for DW light treatment.
• Relative ovary weight was ranged from 3.43 to 4.33% for the five light treatments where the highest percentage recorded for RR light treated birds (4.33%) while the lowest percentage was recorded for GW and DW light treated birds (3.43%).
• Relative testes weight of the RR light treated birds (4.05%) was numerically higher than GG, RW, GW and DW light treated birds (3.47, 3.98, 3.67and 3.53%; respectively). Also Sperm motility showed highest percentage in RR light treatment (90.50%).