Ferrets are photoperiodic,which means their breeding cycle changes due to the amount of daylight,now days are getting shorter the jills will stop coming in to season and the hobs will become less sexually active and thier testicles will retract back into thier body.Now some people keep thier ferrets indoors under artificial lights that are on until the owners turn them off at night,this basically cocks the cycle up and jills are coming into season during the winter months.
IMO the most natural way to keep a hob and an entire jilltogether is to have your hob vasectomised, that way when your