My girls are 5 1/2 to 6 months old and are on the 16% all purpose crumbles from orchelns. I was wondering since they haven't started laying yet when do i need to change them to the layer crumbles. Do I do it now or wait until they start to lay? Is there any such thing as a sterile chicken? My husband thinks they are all sterile since they are not laying yet. I keep telling him to be patient that they will lay when they get ready. Of course it is really hard to be patient as I am ready to not have to buy store bought eggs anymore either and can't wait for them to start laying either.