I've been asked to hatch out some chicks, and I want to this spring. I want to breed one particular hen and rooster, because I have such a mixed flock. A silver polish-buff Orpington would be a bizarre chicken! Thinking of crossing a black jersey giant roo with a Rhode Island Red hen, and a white rock roo with a buff Orpington hen. So, what will these mixes look like, and will it work? Also, how can I segregate the particular birds I want? And also, how long does the rooster have to be with the hen to fertilize a whole brood?