Ron i found keeping a vasectomised hob in with the entire jills i had here very easy, he only bothered the jills when each one came into season & then left them alone , it also stopped the maternal dragging of other ferrets once they went into pseudo pregnancy , all in all it worked here for years untill he died .
I also kept castrates with the vasectomised hob as well as the jills, around 10 ferrets in a group