Ensilage is made by anaerobic fermentation of undried forage or the stalks of corn, sorghum, etc. Ensilage is usually rich in water. During fermentation, the acid content rises and preserves the plant material. Most of the cultivated forage crops are from Europe or Asia. Most forage crops are perennials, but others are annuals.
Table lists some of the major forage grasses.
Many of the same things apply to forage legumes. They also fix nitrogen. Table of forage legumes on pg. Many of the legume forage crops are also excellent bee plants as well. However, animals tend not to do well on fields of pure legumes.