I have five sebright bantams. One rooster and four hens. I opened the coop door tonight to check on them and noticed this huge patch of bare skin on one hen's back. I thought this must be from the rooster. I had five of their eggs in the incubator and on candling I found that only two were fertile. Weird seeing as though he doesn't have many hens to mate and should be getting the job done. Is it possible that he's only mating with one hen? I know there are saddles you can buy to protect them but I'd also like to solve the fertility problem. Anyone have any ideas?