Andria,
 
Who on earth told you that this is a myth?  I did a research paper on
aplastic anemia, including in whole unbred jills, a little over a year
ago.  Included are many references to studies involving whole unbred
jills, which you can reference at your local medical or veterinary
school library, or at many large libraries.  You can find it at:
www.elfferrets.com/other/Estrogen_and_Aplastic_Anemia.doc
 
Thanks,
 
Keri Burleson
[Posted in FML issue 5196]