I think it's probably kinder to take them to the abbatoir, I always worry about good, lifelong homes for them as they live a long time. That said, one of mine did once go as a companion to a lovely home.
Fwiw, I can take my tup lambs and eat them, no problem. Kill my own cockerels and eat them, no problem. Cry when I get back from taking goat wethers and cannot eat them - I sell the meat to other folk, who tell me it's delicious.