We started with 1 drake and 2 females, and all was fine. We recently added 2 more females to the flock. Now all our drake wants to do is chase the new girls, while completely ignoring the older girls. My older girls are very receptive to him. But, my younger girls run from him, because he is very aggressive with them, to the point that the have very few feathers left on the back of their necks. We have tried to seperate him from them for weeks on end and that works for a while. but then he goes back to chasing them. Any ideas on how to get him to stop? Or would I be better off putting him in the freezer?