I have raised chicken for a few years now but I was always afraid to raise the jumbo cornish rocks. The stories I hear are bad legs heart attacks and they eat them self to death. Well this year I got some and nothing like that has happened. This is week 8 and no one is sick or has a bad leg. They leave food behind! We were feeding them like a chart said we should and around week 6 we noticed they had food left over. I supplement with Fermented corn but I subtract some feed for that. The weights are right up where they belong as well. 2 more weeks and it will be the end but so far I would do this all over again.