We have two Rhodebars and two buff Orpingtons. They are 17 weeks old and both buffs are Roos (crowing). Other than not laying eggs, and the noise from crowing is it ok to keep them with the two Rhodebars who are female? Or should I give them away? We only want the chickens for egg laying but don't mind keeping the Roos if there will be no danger to the Rhodebars egg laying productivity.