I have had our chickens for almost a year now and it's winter time now. Mine have not molted, egg production is great but is it normal for them to not molt at all? Also half my hens are bald on their little heads, parts of wings and sides due to mating. We had too many roosters but have since separated them down to one rooster. Is this normal as well? For him to be mounting to the extent they are balding?