Originally Posted by themacpack
The recommended amount you are quoting would be if the OP were using the feed as a "complete" feed - meaning in place of forage. Since the horse in question is receiving forage, the amount needed to supplement that would be lower than the 13.5 pounds recommended.
Good point... those are the only feeding directions they have on the website, but looking at the guaranteed analysis, it's similar to other regular fortified grains that would be fed at 3-5 lbs/day for a 1000 lb horse. Still, 1 lb is not enough to meet nutritional needs.