I disbudded a goatling that I owned when I was at agricultural college many years ago - just to be aware, that unlike calves, that there is an extra nerve to be injected with local anesthetic. There is the alternative that I have also seen used on goat horns of elastrator rings, which gradually cut off the blood supply so the horns eventually drop off. It appeared to cause no discomfort to the goat and was successful, with no regrowth. Can't comment on rights or wrongs of this method - but it originally appeared in the vet books by James Herriot!