How much % of there body weight should a horse eat per day?

1.5-2% of their BW in dry matter (15-20 pounds of hay and more than that of grass) and about .5-1% of their BW in concentrates (5-10lbs) for an average 1000 pound horse.
I've always been told a minimum of 1% roughage (like hay), so for a 1000 lb horse that's about 10 lbs of hay. Most people I k ow, however, feed about twice that for maintenance and higher for working horses and those that need to gain
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