I have had chickens for about 2 years (well, we bought day-old chicks 2 years ago)...and I was thinking about eventually incubating. I have read the stickys here and done a little googling on the subject. But, I still have a few questions. 1) How old is the hen that lays the fertilized eggs? I have read the egg should be not "too small and not too big", but what does that mean? Our oldest hens are 1 year old. (The 2 year old, compeltely free-range hens got carried off by a racoon.) For that matter, how old is the roo? Does age matter in that department? 2) Genetic line. How do I know the roo is not a brother of some of the other hens we have? I think he probably might be...we got a bunch at a feed store of the same breed on the same day, so do you think he is from the same parent as the other hens? So how do would I keep the genetic line ok as continue to incubate once I did find an appropriate roo? For instance, if I got a new roo however often? How long does a roo "last"? 3) Why don't incubators look like nests? Thanks in advance!!!