I just put up an article with the results of a year long study looking
at changes in testable nutrients over long term storage. Results are
in a linked table.
Give your thanks to the Animal Health Foundation for funding.

Is Old Hay Better for laminitic horses?

http://www.safergrass.org/old_hay.htm

Feel free to cross post.
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Are you feeding your horse like a cow?
www.safergrass.org