The Effect of Pre-Incubation And Storage Period on Some hatching Traits for Broiler Breeder Eggs .

A total of 1800 broiler breeder , Ross 308 at 47 wks old , hatching eggs .Were used in the present study . Eggs were randomly distributed into 12 experimental treatments ,150 eggs pretreatment groups . The treatment groups were as follows : T1 treatment without pre-incubation + 4 days eggs storage period T2 treatment without pre-incubation + 8 days eggs storage period T3 treatment without pre-incubation + 12 days eggs storage period T4 treatment 4 hours pre-incubation + 4 days eggs storage period T5 treatment 4 hours pre-incubation + 8 days eggs storage period T6 treatment 4 hours pre-incubation + 12 days eggs storage period T7 treatment 8 hours pre-incubation + 4 days eggs storage period T8 treatment 8 hours pre-incubation + 8 days eggs storage period T9 treatment 8 hours pre-incubation + 12 days eggs storage period T10 treatment 12 hours pre-incubation + 4 days eggs storage period. T11 treatment 12 hours pre-incubation +8 days eggs storage period T12 treatment 12 hours pre-incubation + 12 days eggs storage period. Experimental parameters measured included : Fertility , hatchability percentage from the total incubated eggs and from fertile eggs , hatching chicks length , weekly embryonic mortality ,piped eggs and quality evaluation of navel for hatching chicks . The results of this study showed a significant increase (P