My flock has been normal until a couple weeks now. This is August and my hens are getting their feathers growing back on their backs, as if the Rooster has not been breeding them. My new pullets, 11 weeks old, are laying as well as the adults, however the new pullets are not being mounted either and don't show any signs of it. My black Australorp rooster is fine and no one is in molt. Is this normal?