“…However, especially layer or parent stock hatcheries sometimes need to prolong the storage duration ( Tona et al., 2003b , Fasenko, 2007 ), dependent on the supply of hatching eggs, hatchery capacity, and market demand for day-old chickens ( Fasenko, 2007 ). Egg storage beyond 7 D is associated with a longer incubation duration ( Yassin et al., 2009 ), lower hatchability ( Tona et al., 2004 , Silva et al., 2008 ), lower chicken quality at hatch ( Silva et al., 2008 , Yassin et al., 2009 ), lower subsequent growth performance, and a higher posthatch mortality ( Tona et al., 2004 ). Table 1 shows that broiler chickens originating from eggs that were stored beyond 7 D did not seem to differ in chicken weight or YFBM at hatch but had a 0.9-g smaller residual yolk weight at hatch than chickens originating from eggs stored for less than 7 D, which may be explained by a longer incubation duration.…”