Years ago i lost a few old jills to old age and so not to be short of ferrets i took in a pet ferret planning to bred from her and keep the young . It was a good job she never came into season as she was the most usless ferret iv'e ever seen sheonly ate dry grub and never went down a hole .There can only be one type of ferret for me bred from worker to worker ,I prefer a good sized jill that has the pace for a full days ferreting nothing too small the rabbits pull it about and nothing to big iv'e to dig more than i have too as if a rabbit wont bolt i know my ferret will kill it