I have 20 Cornish X from Mt. Healthy here in Ohio (on special at TSC, couldn't pass them by for only a buck each) that are five weeks, old, and some peeps from Meyer that are just five days old. So far, there is a big difference. I'm surprised by how bright yellow the Meyer peeps are, and by how calm they are. Don't think I've ever seen such calm chicks. I wonder if anyone else has experience with Cornish X from different hatcheries. I'm very interested to find out whether they dress out at different weights once processed.