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当前我国正在进行农业结构调整，大力发展畜牧业是结构调整的重点。各地都在积极发展青饲作物的种植，能够作为青饲作物的有多种类型，其中主要是苜蓿和青饲玉米。苜蓿营养成分含量较高，但生物产量较低，只能做为精饲料，而青玉米由于生物产量高、适口性好、易管理、成本低，
At present, our country is carrying out the adjustment of agricultural structure and vigorously developing animal husbandry as the focus of structural adjustment. There are many types of green fodder that are actively cultivated around the world, mainly alfalfa and green fodder maize. Alfalfa higher nutrient content, but low biological yield, can only be used as a fine feed, and green corn due to high biological yield, palatability, easy to manage, low cost,