I had a roo, he was killed and I do have a 2 day old roo that has some growing to do b4 taking over the flock. I know a hen will take the job over and Marylyn has and is doing a great job. I am wondering if the hen who took over for the roo will lay after the new roo is introduced? I am tempted to buy a full grown roo to put with the flock now but I don't want to possibly introduce illness into my flock if my hen roo will lay after my roo is old enough. How many times can I say roo. Eta, I forgot to mention I just lost my roo 2weeks ago and my pullets are 3months old so none of them are laying yet. Marylyn keeps watch and puts them to bed right now. The 2 day old roo won't be mature until feb and I expect my girls to start laying sometime in Jan.