Anke, I keep wondering, but while there's life there's hope?
We'll see how he goes on today, maybe not getting colostrum in sooner is the problem.
I am afraid I have probably become a lot tougher recently, if I think a lamb/kid/chick is not going to be reared to at least meat size (without serious intervention and ongoing extra care) I will pts humanely and quickly early on. And if their quality of life is not there I cannot justify pushing on.
But he may be a fighter, I have had a very young male kid that I brought up from way down south having been assured by the seller that he was easy on the bottle... well he wasn't. But with a lot of perseverance, emergency treatment at the vets and finally wanting a bottle of milk when he was 7 months old... he grew to be a breed champion!