In this guide, equine nutrition scientists Dr. Stephen Duren and Dr. Tania Cubitt explain the role alfalfa can play in a balanced equine diet. Alfalfa hay is one of the most widely discussed forages in the horse world. Some owners avoid it while others rely on it, but the reality is simple: alfalfa is a nutrient-dense legume forage that can be a valuable tool when used thoughtfully in a horse’s feeding program.