All I get is.......
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I can't imagine anyone claiming that pithing would affect plucking. I don't do it to chickens; they stay pretty calm in the cones, so I've only encountered it in lab work. It's simply a way of rendering the animal brain-dead while leaving the heart & major body systems functioning (temporarily) for research; in the case of chickens it would render them unable to feel/react to slitting but nothing else!
I did some research on this - and it looks like you folks are absolutely right, and now I am driven to find instruments. (apparently there's a specialized knife/tool for it) I didn't realize that the control of those muscles was entirely by that portion of the brain! The idea of being able to pluck without scalding & ruining the epidermal layer is very compelling... must learn this! :