I agree with Speckled Hen. I wait three weeks to make sure the sperm are no longer viable before I breed birds. I have corresponded with a chicken fertility specialist from the University of Arkansas and that was his advise to me.
Well today is day 25 and they are fertile!!!! Guess I'm going to start collecting for the bator! I'll shoot for a Jan. 8th or 9th hatch!!!! Leghorns are what I'm trying to breed!! I'll stick some barnyard mix in there too! Am SO excited!!!!! Thanks for the info!!