the effect of lightings period on eggs production precent and hatchable eggs percent in broiler-breeders flocks

this study was conducted to determine the effects of increasing lighting after peak production on eggs production and hatchable eggs in broiler breeder hubbard f15. in this research we used from 4 growing saloons, that in per saloons were 5250 hubbards broiler breeder hens. in this experiment we used by line design way of glm for analysed data, that we considered the effects of two parameters, such as 14 and 16 hours lighting in 4 saloons. the experiment did during 21 weeks(30-50) after the production peak(29). we study the effects of lighting , week, lighting*week, day(week), and saloons parameters on eggs production persent and hatchable eggs persent. the results of this study show us that the lightings effect on eggs production persent was significant (p0.05). the weeks effect was significant on both parameters, and had a natural performance on eggs production uggest. the effect of  lighting*week variable and was significant (p