Horses won't eat

Due to all the heavy rain we had in Ohio this spring, our first cutting was 6-8 weeks late and therefore very mature.  It is very course and stemmy and horses won't eat it.  We have hauled a couple loads back home when the horses wouldn't eat it and had one load rejected.  We don't have many cattle around here, so what are your suggestions?  Sell it cheap enough so the owners make the horses eat it, sell it at the hay auction and buyer beware or what?  Any ideas?

 

Horses won't eat