Shelf life of wrapped bales

Hey all,

  I apologize if this has been asked before -- I'm wondering about the shelf life of haylage. I have leftover bales from summer 2014 and wondering if they'll keep through until next winter. Stored outside of course, but the wrap is in good shape; can't seem to get a clear answer from various sources about how long the forage is good for. Should I keep em or toss em?

  Thanks.

Shelf life of wrapped bales