This was my fist experiencs with Cornish Xs. I did Dixie Rainbows last year. The Cornish were way better, in my opinion. I let them go to 9 & 10 weeks. I fed them a 24% Dumor game feed from TSC through six weeks and then switched to a 18% protein locally mixed feed after that. And this past week, I fed them corn, too. I let them outside at 2.5 weeks of age -- into a 12x20 run. I started with 12 chicks and culled one at 3.5 weeks because it was acting weird -- not eating for a couple days and sat with eyes closed. Other than that I had no issues at all. They eventually free ranged from about six weeks on -- just in the evening. They were hefty yet very energetic right up until the end (and in 90 degree weather). I raised them right along laying pullets with no problem, but they all had plenty of space. I can't believe how much meat is on them compared to the Dixie's (and they put that on in 7 weeks less time), oh and a nice layer of fat! They came from Townline Hatchery in Zeeland, MI. Sorry for the rambling, but I had such a great experience! Just thought I'd share!