This is a crosspost, but I wanted to have my thoughts here where I can find them:
Yesterday I was thinking about the birds I culled Tuesday and I realized that I really ought to have culled the crossbeak as soon as I realized how bad his beak actually was.
I had been checking his crop regularly to make sure he was eating, but not only was he visually about half the size of his brothers, when I got him plucked his breastbone stuck out like a knife. Slow starvation in the presence of abundant food is not a happy existence. Should I have another such bird I'll cull him as a chick and give him to the wildlife like I do with the dead-in-shell birds at hatching.
But Slowpoke, my deformed cockerel, lived a happy life while it existed. I'd assisted him to hatch, did therapy on his splayed leg and deformed foot, and, since he never seemed to be in pain (though he did grow more slowly than his brothers), allowed him to hang around with the company of others until I was ready to do the culling.
My hands brought him into the world, cared for him while he was here, and took him back out of the world as mercifully as I could manage. After he was plucked I discovered that his deformity was even worse than I'd thought -- to the point that he had only a 2-finger gap between his breastbone and his pelvis. Had he been a hen she'd have died trying to pass her first egg.
He probably ate enough feed in 6 months to be a very expensive 4lbs of picked chicken, but he enjoyed his life and it wasn't wasted.