Senior horses don't process protein as well as the younger horses. That is why we now have special pelleted feeds for senior horses. This is completely balanced. It is also a safe feed. Btw it contains beet pulp, flax, extra oils, etc. Start at 2 lbs twice daily then if time permits, after four or five days up it to 3 x daily, along with the hay and pasture. If you put the pellets in an old bathtub it will slow her down to where she's nibbling instead of bolting them down. The faster in, the faster out.