We just got our first egg yesterday from what I believe to be as the mother, a 7 month old buff silkie. We got her last week and she had been laying prior to her coming to us, but this is our first from her since her arrival. My kids would like her to hatch it, so we left the egg in the hen house. Several hens have been taking turns sitting on it, though at one point it was left alone and cold. I know that hens will lay 10 or so eggs and then lay on them. I am wondering a couple things. We only have hens, though where she lived previous there were two roosters, so how long will her eggs be fertile that she lays, or are they even fertile at this point? If they are should I just let her lay a bunch and let her set on them? How do you tell if an egg is viable or not? I have been reading a bit about candling, but I am confused about the process. Any advice from you more experienced chicken farmers? Thanks!!!