Rice bran or Beet pulp can both be beneficial to your horse. Figure out what your horse's diet requires and which one is a better addition to your horse's regimen. Flax seed has a higher energy density per lb than both.. Vegetable Oil has 4 times the energy density per lb then those options and the highest percentage of Lysine (better digestion). Sounds like your horse has enough fiber in its diet.. maybe an oil is the way to go?
Originally Posted by jazzyrider
it may not be nutritionally COMPLETE but what horse feed is? That's where supplements come into play. .
Actually most feeds are loaded with vitamins and minerals because feed company's don't want to get sued. The only supplements that would be beneficial to your horse is a fat supplement, MAYBE a joint supplement (although not adequately tested or proven) or MAYBE a vitamin supplement if your horse has a severe deficiency. Supplements are also not regulated so you don't even know what you're really getting.. vitamins also deteriorate over a rather short amount of time.