I have to add that the Cornish cross are not all bad. I don't like that they can not reproduce, but mine in a chicken tractor the Joel Salatan type, turned out excellent. They didn't just sit and eat, they foraged and ran around. They even got out once and we called and shook the feed cup and they all came running back. We only filled the 4'feeder once a day and they didn't have day organs at 10 Weeks, we butchered them ourselves and they were quite lean. It all depends on how they are handled. Just like horses can be overweight and underweight of the same breed. Just depends on conditions. I have a group arriving soon.