I haven't read all of the comments, but personally, I have raised cornish cross like a normal chicken. I fed a ground pig grower from a feed mill. An old timer told me the nutritional value is very close. If you do not over feed the little monsters they won't be a hideous creature with health issues. Mine were free ranged, lazy, but free ranged after a certain age. I started by picking out 4 at a time of the biggest. At least 5 #. I'm very happy with the results. Not cripples birds. A lot of internal fat. I kept some females for breeding to my 1/2 cc rooster. Chicks from them are nice.