I am on day 18 and have just candled my four eggs that were defo live three have larger air sacs and one is completely dark but no bad smell ... Is this one now dead???
I wonder if anyone can help me I have a mix of chickens
and I took in a cockerel when he was only a chick this is him now he is about 6months old
He lives with my laying chickens and crows every morning but I don't know what breed he is ????