I am going to get fertilized polish eggs in spring and giving them to whoever goes broody first to raise (Since I don't want a rooster). I have all of that figured out, and since it will be spring they will be plenty feathered out by next winter (WI winters are very harsh sometimes) but they don't have as big/much feathers as my hardier breeds I have now (Easter Egger, Buff Orps, Barred Rocks). So I'm asking, how much can they handle? (The age will depend on when the hen goes broody in spring)