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The aim of this experiment was to study the sensitivity of inbred lines of Fayoumi chicks to seasonal variations. The results indicate that the inbred lines were more sensitive to seasonal variations than the control ones and L 25 showed the maximum responses in fertility and hatchability. The results also show that the local breed has been well adapted and often resists the harmful effect of inbreeding. Slight inbreeding had maximum response in viability and this may be due to early homozygosity occurring in alleles responsible for viability. For body weight, it was noticed that sensitivity of inbred lines decreased as chicks advanced in age. Therefore, these findings are important to stabilize the production of the local breed, all the year around.

The current study was conducted in private poultry farm (area of 120m 2 ), Shibin El-Kom, Menoufia Governorate. The experiment was extended from April to May 2014. The great object of this study was to determine the effect of feed forms on productive and economical efficiency of two broiler strains (Cobb 500 and Ross 308) at ages 7, 14, 21, 28 and 35 days. Chicks were individually weighted and randomly assigned to 3 experimental groups nearly similar in average body weight (40g). The birds of the first, second and third groups were feed on crumble, mash and pellets, respectively. Chicks housed on floor with sawdust. Feed and water were available ad libitun during the experimental period which lasted for 35 days.Body weights at different ages, growth rates, feed consumption (FC) (kg per bird/cycle), feed conversion ratio FCR, mortality and uniformity were studied. The main results were: 1. For Cobb 500 strain, mash feed had a higher body weight at marketing age (35 days). 2. Ross 308 strain, pellet feed had a higher body weight at marketing age (35 days). 3. Ross 308 strain fed on crumble, and Cobb 500 strain fed on mash had lowest mortality %. 4. The best economic efficiency was obtained with pellet feed form for both Cobb 500 and Ross 308.

The present study investigated the broiler production under different LED light colors and strains. In addition, studying effect of LED light color on body weights at different ages, feed consumption (FC), immunity, growth hormone and some carcass traits. The experiment was extended from January 2019 to February 2019. The highest mean value was recorded for IR strain body weight at 7 days of age (172.4 ± 0.60, 172.2 ± 0.9 and 169.94 ± 0.99 g) in green, blue and white light, respectively. But for Cobb strain (169.42 ± 1.03, 167.22 ± 1.04 and 168.028 ± 0.83 g) in green, white and blue light, respectively. Where, body weight at 35 days of age was recorded for Cobb and IR strains at blue light (2002.17±12.81 g) and (2083.51±19.61 g), respectively, followed by white light (1985.22 g) and (2001.91±16.30 g), respectively, while green light registered the least value (1980.68 g) and ( 2001.82 ± 10.66 g), respectively. There were significant differences (P ≤ 0.05) in the values of growth hormone concentrations between control group (white light) and other two lights groups blue and green, on other hand, there were no significant differences in the values of growth hormone concentrations between Cobb and IR strains, the interaction between LED colors and strains was insignificant (P = 0.982).