The complete feeds are not considered
grain. Grain would be oats, barley, COB (corn oats barley), BCM (barley corn
molasses), wheat…any whole grain. If you look at the ingredients on the
complete feeds, you’ll see that they usually have beet pulp, processed
alfalfa or other type of hay, bran of some sort, along with several other
ingredients.
If the horse looks good, and doesn’t need or want the
feed, I probably wouldn’t feed it, but maybe the vet thinks the horse is
in need of the vitamins or minerals that are in the senior feed? Or maybe the
horse’s muscle tone isn’t as good as it should be? Is it being
ridden regularly?