I don't think an extra step in there of zapping the birds would add to~ or take away from~ the low stress process that happens on butchering day here. Again, I think this is one of those things folks come up with to make themselves feel better about killing the bird but doesn't necessarily do anything of benefit for the bird.
I agree with both of these statements. Killing and processing chickens is not something we do lightly. OK, I'll confess. I don't even kill them myself. I've never had to. DH takes care of that duty for me. I hold the feet, he lops the head off. It's always kind of a sad day for me when we butcher our spent layers, even though I don't try to make pets out of them or become attached. The meat birds aren't quite hard for me. I think because we don't have them around for as long as the layers.there is no pretty or kind way to take an animals life. All you can hope for is fast humane kill and that is simple.