I have 3 Blue Laced Red Wyandotte Hens and a BLRW Roo. At present the are in with all of our other hens and roos. I want to breed the BLR's. So, I have a portable coop in which to put them. How long do the hens have to be separated before I can be sure that they'll only have BLR's? Are they likely to hatch out their own eggs? I really don't want to incubate.