I lost a CornishX today that was 5wks old. I had fans running in coop and it was around 70deg inside. The bird felt warm and was panting and not wanting to move. When I picked it up is when I noticed it was warmer than usual and the skin was a dark red color instead of light flesh color . A few hours later it had expired when I checked on it. I noticed another that was acting similar when I found the dead one. I'm feeding them the starter / broiler combo feed and the first batch of birds did well on it. If these birds show the dark red and panting is this the heart problems I've read about and will they still be worth processing if caught before expiring ? I have eight of them left and was hoping to wait a couple more weeks to process.