Tote i think your spot on its clear from what i have read on this thread that not all jills drop dead ... i do think its very different from the text book stuff that seems to be quoted a lot & taken as gospel by some .
Maybe the ones who protest so much have never actually had a ferret long enough before its neutered so never has a season to test that theory
i took a couple of jills on last year & asked for some advice regarding when they come into season i was told about the options open to me & had then jabbed i will probably have them jabbed again next year as i doubt t