I have 5 silkies: 4 hens and 1 roo. The rooster is a white silkie as are two of the hens. They were raised together for eight months before any other chickens were added. Soon after the white silkies began mating and laying, I received two more silkies: a black hen and a gray hen. However, they have been together for 5 months now, and the rooster does not even attempt to mate with them. I don't know if that is his personal preference, or if there is an actual reason he doesn't mate with them. At first I thought that they just mated when I was not around, but I have tried incubating their eggs twice now and there are still no fertile eggs. He mates non-stop with the white hens all day long, but the black and gray one are ignored. Is there any way that I can get these chickens mating with each other?