I've got a bony rooster. We've wormed him and he's been on some injections from the vet for a cold which he's better from, though I think he needs some more. He's always been thin since we've gotten him. I've been giving him chick starter since I read on here someone suggested it. He gets corn and treats but his breast bone is still very prominent. I can't feel any meat around it. How can I put some weight on him?