I have raised two cornish x's. One was a Tyson rescue who was three months old, one was a week old chick. Both lived to be approximatly 7 months old. Around six months you will see them begin to move slower and breathe hard. Then they will get to where they just lay around. Slowly their heart and lungs just give out. Its not fair to them to let them get like that, this coming from the queen of soft hearts. If I were you, I would either give it to someone who will butcher it when the time comes, or cut off your emotion ties with it so you can do it yourself. I would never want to have to raise another, because they don't understand why you are letting this happen to them. You can tell.