I fed my cornish X on oats and cracked corn for their last 2 weeks. It put a nice layer of fat on them, they loved it, and they taste really good! I like to save any excess fat off the birds when I butcher and then render it down. I have a quart jar full in my fridge right now. I like to use it to fry potatoes for breakfast.
Good luck on getting your bird healthy and back up to weight.
Good luck on getting your bird healthy and back up to weight.