Our daily feeding recommendations are forage (hay/pasture), fresh water, HS-35 (always fed according to the horse’s weight), plain whole oats (if needed), and free choice loose salt—Redmond Salt.

Formulated for horses from young foals through adult life cycle, including pregnant mares

Feed HS-35 daily, individual, using the enclosed one cup measure.
500-lb horse = ½ cup
800-1,000-lb horse = one heaping cup
1,200-1,400-lb = 1½ cups
Provide free choice salt at all times.
Do not mix this supplement with other vitamin and mineral supplements.

All you need to do is know the horses weight in approximation and then feed according to that weight number… very easily fed by how they group weights together.

Can’t be any simpler than that…