Disbudding, as I understand, should happen as soon as possible...if you have buds, they need to get burned. I don't disbud mine, so I'm not positive on that information.
I band mine at about 6 weeks. You don't want them to be too small and not dropped into the sack yet and you don't want them too large for the band, either. I usually do it before weaning and after their first vaccination. I do a tetanus booster, too!
Banding is the easiest and least invasive method, though often thought of as cruel since you are cutting off the blood supply to the area with a rubber band. People band cattle, too. They can be "gelded" like a horse, but that's very invasive and offers a big chance for infection. There's a method of snipping/pinching the tubes with a device called a Burdizzo that's supposed to be less painful than banding. However, you have to be able to clip/pinch the tube correctly or you run the risk of still having a billy goat! It's also hard to tell a wether is not a billy (in my opinion) when they've been "smushed."
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