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¹ Abant İzzet Baysal Üniversitesi, Ziraat ve Doğa Bilimleri Fakültesi, Kanatlı Hayvan Yetiştiriciliği Bölümü, Bolu
² Ankara Üniversitesi, Ziraat Fakültesi, Zootekni Bölümü, Dışkapı, Ankara - Two different trials were realized in this study. The effects of egg storage time (2-10 days) and turning frequency (24-96 times/day) applied through incubation in first, the effects of breeder age (young-old) and incubation program (classic-new) in second on hatchability of fertile eggs and broiler performance were investigated. The hatchability of fertile eggs in young flocks was higher than olds (p<0.05). It was found that decreased fertile hatchability at 10-day storage time were improved (p<0.05) by 96 times/day turning frequency. Although, the fertile hatchability in new program was higher than classic, but differences were not significant. Whereas hatchling body weight of chicks obtained from the eggs stored for 10 days was higher, 14^th and 35^th broiler body weights were lower. Also, only 14^th day broiler body weight from 96 times/day turning was higher. However, it was found that an association between flock age and program and the fertile hatchability of old flocks were increased, when they were incubated through new program (p<0.05). In conclusion, our results shows that new incubation program improves fertile hatchability in old breeders, whereas fertile hatchability and field performance on eggs stored for 10 days were decreased but 96 times/day turning instead of 24 times/day improves decreased fertile hatchability. Keywords : Broiler, Incubation, Breeder age, Egg storage, Turning frequency, Setter program