When the Cornish X or Red Broiler are bred, the chicks don't have the same qualities of their parents. The hybrid chickens were bred from different breeds, so the chicks will inherit different genes. However, I think we can reverse engineer them by selective breeding for desired traits.
I...
I would cross a Big Red Broiler rooster and Jumbo Cornish X hen from McMurray. Then breed some female chicks back to their father and in a separate pen, breed brother and sisters together. Select the best from these two groups of chicks for your ABCD parent stock. It will be a challenge line...