I've never hatched eggs, but I'd like to try it. I raised two sets of chicks this year. The older ones began laying in July, and the younger ones should start in the next month. The roosters are already doing their 'duty', but how long should I let the hens lay before I take eggs to incubate? I know that the early eggs have small yolks, so I assumed that these would not be good to use. Is there a rule of thumb for this? I will probably wait until February or March, because I don't want winter babies, but I am curious what you think.