I second give him some time. I had a roo injured his breastbone in a fight with an older roo, didn't know he was "that old" yet and should have separeted him earlier. For th whole first season he could only breed hens that were very cooperative and preferred it if they parked themselves next to a handicap rail so he could hold on. He is fine this year. Fertility is good and the lump on his breast bone is almost gone too. It was my best rooster Goody, (see my website) and I just HAD to give him time. He is the best roo ever and plus I really NEEDED him in my breeding program. Well worth the wait so far, so good. Give your guy some very docile hens to practice on, even if they are not the right breed.