I found my cornish x would clear the pasture of clover right after I moved the tractor. Taking their feed away from them for 15 or 20 minutes, I observed that they would forage and scratch on the new grass. I filled 2 3' troughs twice daily and ended up with pretty decent sizes at 6 weeks on 500lbs of feed for 55 birds. Towards the end I was moving the tractor 3 times a day. Last year we did 25 freedom rangers in the same tractor and aside from not laying down as much, the behavior between the two types was not that much different.