The Worst Advice You Could Ever Get About horse feed for weight gain

https://horse-feed-tips401.urbanvellum.com/posts/which-horse-feed-is-the-best-for-heavier-horses

A carefully planned horse feeding routine helps maintain healthy digestion, consistent energy, and optimal body shape. Blend good hay, grain, clean water, and regular meals with forage management, mineral supplements, and ongoing equine nutrition care.