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OK genetically they are still birchens. I would not breed a roo that had no color. He would be dinner. Pullets are different. BCM pullet often don't show copper but if they type is right you should use them in your breeding, but you should mate them carefully to try to add the color back to the pullets. The roos will pass the coloring to the pullets.... especially in birchens since silver is sex linked.