I culled my oldest rooster, he was starting to be very aggressive towards my kids and we tried everything to break him of it. I had another cockerel in the coop/run with him and the girls. He is now 6-7 months old, and in the 4 weeks since the other roo went to freezer camp, he has just began to crow. My question is, I have yet to see him mount any of the hens, however I don't spend all day out there (just 60% LOL). Is there a way to see if eggs are fertile when you crack them? I have him in with all the hens, but would like to use him to breed with a couple of my hens... What should I look for?