One of my pullets turned out to be a roo. I cannot keep him in the city and am planning on rehoming him. I would like to replace him with a new hen. The question is - is it better to introduce the new hen while he's still around or to wait until he's gone. The roo and my two hens are about 20 weeks old and I've only been able to locate a 7 week old Australorp hen to replace him. The other two hens are a Speckled Sussex and a Blue Cochin.