ear tattoo

I know rabbits have to be tattooed in order to be showed, but do you have to tattoo a rabbit before you sell them to a show breeder who wants to show the rabbit, or can the person buying the rabbit from you tattoo the rabbit themselves?

Hi, I have a tattoo pen for my rabbits to tattoo their pedigree number in the left ear but my question is how often should I change the needle? My kit came with three needles. Thanks

I tattooed my rabbits 2 weeks ago and will be going to a show in 2 weeks from now! When will the ink start to scab off? Will the be ready for the show? And can I wash the ear with alcohol to got the ink off or is it to early? Thanks