I must of missed your first post.
I'm sorry you're having difficulties with your bird.
I think it is purely up to you and what you feel is the correct decision for you. It's completely heartbreaking when they're having difficulties..especially when you want the best for them and when you already have a ton of things going on.
Like you've mentioned, it looks like the chick has had issues from the get go so that's an obvious strike against it. But, like you...I really hate to call it if there's hope. I have a line of chickens that I keep from breeding, the roosters showed a weakness for developing wry neck when they were younger. I did have to put one down because it became clear that he was not going to get better. I've also had one from this line get better from a bad case of it. I gave a multi-vitamin poultry vitamins and I put him outside (it was warm in the spring) in a live or die situation. As soon as he got outside, he got better and hasn't looked back. I've kept the entire line purely for observation (the females are some of my hard core broodies) But I look forward to the day when the females are gone. I finally plan on selling the males before winter. They've never displayed wry neck again since hitting adult hood. They get fed grain exclusively and don't have a balanced diet. (Very surprising)
I have culled a couple of chicks for the express reason they wouldn't have able to survive with any quality of life. It's incredibly hard of the heart. I am breeding to improve genetics and sell eggs/chicks...but I do have some and will probably always have some that will be just pets and will not be bred. Their eggs will go to feed our pets.
