Ok - this is my first thread. I've been lurking, reading and reading for a few weeks now. I've gotten most of my questions answered by others' questions but this is one I haven't run across yet. My husband and I are thinking about ordering some Jumbo Cornish X Rocks to supply some meals for the fall. However, the hatchery says that they shouldn't be raised at altitudes above 5000 ft. We live at 7300 ft. Can anyone tell me why I shouldn't get them? Why they shouldn't be raised at this altitude?