Your horse needs proteins, in order to built muscles. No proteins, no muscle. Metazoa Luzerne HP23 is a high value proteine biks. HP23 is made of the leafs of alfalfa. The percentage of proteins is therefor higher than in normal alfalfa. If your horse has to perform in sports, like show jumping or eventing, you may want to add some additional proteins to his dayly diet. 1 to 2 pounds a day for an average horse is enough. No additional products added, no Melasse, just alfalfa.