I have a 4 month old partridge cochin roo. He is about the size of my Orpington hens. Are they slow to mature at full size? I recelty went to our state fair and saw the stadard cochin roos, and boy were they HUGE! Boss is not nearly the size they are, but he was way bigger than the cochin banty roos. How long will it take him to get as big as the fellas at the fair? He doesn't crow either!!! What kind of rooster is he?? LOL Can't wait for the day he crows, he just seems so small now that I saw the big guys!