I agree with Andi I do clip tails and notch ears but only because the judges at the shows won't consider a pig that hasn't had this done and I sell the majority of my pigs to kids for shows. I would rather not it's a outdated practice but that s what the judges want.
Clipping the tails is supposed to keep other pigs from chewing on them I guess in supper confined housing this is a problem mine are on pasture though. Notching the ears is done for identification right ear is the litter; left ear is the individual. Its a fairly complex system of numbering though and I have had to show several judges and ag teachers how to read them but they still insist it be done even though they can't read them plastic ear tags make this system illogical.