It is not a wise move to let your jill stay in season, Think about it (can every person who has wrote a book be wrong aswell as all the vets and the biggest majority of ferret owners) No they are not wrong the truth is if you leave your jill in season she will start by prancing up and down her cage day and night while she is desperate to find a male, then she will; start to loose hair around her rear end and also loose alot of body condition, and is running a great risk of getting aplastic anemia (bone marrow disease) if left in this state, yes i have known people who have left there jill for