Most ferrets in the States are sterilised at a very early age but those in other countries are sold whole and the owner has to take the ferret to the vet to have it either spayed or neutered.
This article by Long Beach Animal Hospital shows how a jill is spayed and the photos are pretty graphic!
Spay Ferret (LBAH)
Neutering And Contraception For Ferrets (Vets4Pets)
Ferret neutering (Paragon Veterinary Group)
DISCLAIMER: The information contained on this page is not meant to replace seeing a veterinarian if you think your ferret is ill. It’s only meant to supply general information on a particular illness which was obtained either from personal experience with my sick ferrets, or from books and/or the Internet.