I am looking for a breed of chicken that is great for meat production and does not get problems like cornish/rock crosses. I had an order of 26 cornish rocks and only had about 20 to butcher when the time came. They just randomly died, had liver problems, heart attacks, and many many broken toes. I have not had any big problem with the 400 or so laying chickens we have had over the years. I would like a breed of chicken that can have access to food 24/7, and does not have heart, leg, liver, bone, etc problems. Any advise on selecting a breed would be appreciated, thanks everyone for reading.