Penn State Extension writes:
Rotational grazing can provide more feed for your horses than continuous grazing- but only if you know how to do it right.
Most farm managers have heard the term ‘rotational grazing’ and have a vague idea of what it means. When used correctly, rotational grazing is a management practice that results in healthy, thick stands of forage to provide horses with a significant source of nutrition. High-quality pasture can meet or exceed the protein and energy requirements of horses with low calorie needs. Rotational grazing requires a bit more oversight than continuous grazing, but the payoff is increased feed value for horses and productive pastures that need less frequent renovation. It is also a good way to manage moderately stocked farms for maximum productivity.