Can eggs layed just after the hen is fertilized be more likely to produce female chicks? I have read here that chickens stay fertile for 2,3-4 weeks after mating with a Roo. Is breeding chickens at all like breeding dogs? Like with breeding dogs, female pups are often produced during the first stick. So my question again is......Will the eggs layed just after fertilization be more likely to produce females over male than eggs layed toward the end of the 2,3-4 weeks? I hope I made some sense?