I went to a equine feeding seminar. They explained
that the grains were absorbed in the foregut, and the hay in the hindgut.
If you follow the grain with the hay, it pushes it into the hindgut, and
decreases optimum absorption. They gave a good amount of time as being 2
hours after the grain before feeding hay. Or, feeding your hay first, then
giving grain. So, I feed hay in the AM, grain sometime midday, and
hay again at night.
