my cornish rooster Big John is 2 years old and he breeds the leghorn hens like crazy he was kept on a strict diet for first year and free ranged as much as possible today he lives with the hens and is probly 15 pounds or more and runs around and eats all the time now i started with 10 5 hens and 5 roos all the hens died and all the roos lived once the roos got around a year old they got so violent to echother you would of thought they were Gamefowl so i culled all but the biggest one