I remember when I was a kid that a guy used to have a business driving around to all the farmers with his stock. He'd put the calves in the stock and would saw off the horns with a hack saw, taking a bit of the skull with it. There'd be a whole in the larger ones big enough that you could see the brain. He'd just pour on some topical antibiotic like iodine, and cover it with a piece of cheese cloth. They always lived, but I wonder why. lol. I know that you have to hold the disbuding iron on for ten seconds in order to make the horn die. I still remember the smell when I used to do my goats. Don't miss that job at all.