There are 2 principal types of forage crops fed to horses: grasses and legumes. Alfalfa is a legume. The nutritional difference between these two plant styles will depend on a range of factors which include soil variety, maturity at harvest, and climatic conditions. It may be helpful to refer to https://ridingboots11864.bloguetechno.com/the-fact-about-horse-supplements-that-no-one-is-suggesting-67695303