When I added my cochins last spring to my regular size flock, I didn't realize they were bantams. I brought home 4 straight run, 3 were hens and 1 a roo, and added them to my 3 month older hens. I have since lost 2 of those cochin hens, so I'm left with only 1 cochin hen and 1 roo. So, the only roo I have, is a small bantam, and 7 out of 10 hens being full size. I'd like to be able to have most of my eggs be fertile. Does anyone know if a small bantam roo will mate with a large, hen like a black astrolorp? Honestly, hes tiny, maybe 3 times as small as one of my huge astrolorps, and they will peck at him, to tell him to get away. I've never seen him attempt to mate with them, nor have they "submitted" to him. Will larger hens not let him mate? If not, I might need to find a larger breed roo to take on the larger hens. Any thoughts?