Horses like Teff?

Been reading about Teff for quite sometime now and decided to try a 2 acre patch behind the house to see how it does. Love everything about it so far. Looks good cuts good and yields good too.

I got my first cutting out of it this week and couldn't wait to start feeding it. I gave my bosses horses a sample bale today and the chewed on it for 30 seconds spit it back out and looked at me waiting for their usual brome. Are these horses just that picky or is Teff a hit and miss feed?
thanks in advance

Horses like Teff?