近年来,多年生牧草不仅用作青饲料和干草,而且用以制备青贮料与半干青贮料。这首先是由于牧草制成的饲料较便宜,且营养物质含量超过其他饲料作物。例如,由多年生牧草制成的青贮料的蛋白质含量比玉米高25.4—41.9％,胡萝卜素高33.6—62.6％。饲料品质在极大程度上取决于刈割期。作者于1980年、1981年探讨了青草、干草、半干青贮料与青贮料的品质及营养价值 In recent years, perennial grasses have been used not only as green fodder and hay but also as silage and semi-dry silage. This is primarily due to cheaper fodder made from pasture and more nutrients than other forage crops. For example, the silage made from perennial grasses has a protein content 25.4-41.9% higher than corn and 33.6-62.6% higher carotene. Feed quality depends very much on the cut-off period. The author in 1980, 1981 explored the grass, hay, semi-dry silage and silage quality and nutritional value