Mick,
Simply take a sample from each patch of hair, and tie it onto a hook and see to what extent it will flare (if at all). Record your findings by writing on the back of the hide as to what the results were, or by attaching a tag to the hide.
A quick reference for various hairs can be found in Chris Helm's online catalog. Chris is one of the world's top authorities on deer hair. Simply go to his website at http://www.whitetailflytieing.com/ and click on his online catalog, which is in PDF format. Go to pafe 14 of the catalog for a description of hairs and their uses.
Good luck!
Joe
Joe Valencic
Life Member FFF
Rod Builder in Chains