I have 22 BO's at the moment and of those, 8 are roos/cockerals. The other 14 of coarse are pullets/hens. They are about 12 weeks old. I want to keep 1 or 2 roos for reproducing. But I want to set aside about 5 hens just for egg purposes. At what age/weeks should I seperate those 5 hens to keep the roos from trying to reproduce with them?