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Good question.  Yes, intact male ferrets during the breeding season will
have hair loss and have an increased musky odor, and sexual behavior
Sometimes they will have aggressive behavior too.
 
Sounds like adrenal gland signs because these signs are caused by the
same sex hormones!
 
No, I do not think there is any testicle left behind when they neuter
these boys at 4-6 weeks of age.  Neutering is a very simple surgery to
do, but anal gland removal can be a hard surgery to do.  Thus it is
not surprise out of the hundreds of thousands of ferrets a few will
have problems from the anal gland surgery.
 
Thus if your young, neutered, male ferret has a thin hair coat
(especially on the tail) this may actually be an early sign of
adrenal gland disease, despite the young age.
 
Hope that helps,
Jerry Murray, DVM
[Posted in FML issue 4610]