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“龙牧８０１号”与“龙牧８０３号”苜蓿新品种，是１９７６—１９９２年期间，用黑龙江省西部羊草草甸草原上的野生扁蓿豆（ＭｅｌｉｓｓｉｔｕｓｆｕｔｈｅｎｉｃｕｓＣ．Ｖｃｈａｎｇ）与黑龙江省地方良种肇东苜蓿（ＭｅｄｉｃａｇｏＳａｔｉｖａｚｈａｏｄｏｎｇ）利用辐射人工诱变方法，对亲本二倍体扁蓿豆与四倍体紫花苜蓿进行辐射处理，动摇了亲术遗传性．提高了亲合性，攻克了远缘杂交关，获得杂交成功。采用集团选择法选育，历经１６年，首次育成了“龙牧８０１号”和“龙牧８０３号”苜蓿新品种．通过品种比较试验、区域试验和生产试验结果表明该品种具有抗逆性强，产草量高的特点。
“Longmu 801” and “Longmu 803” alfalfa new varieties, is 1976-1992 years, with the western Heilongjiang Province Leymus meadows wild on the plateau beans (MelissitusfuthenicusC. Vchang) and Heilongjiang Province, local varieties Zhao Medicago sativazhaodong used radiation artificial mutagenesis to radiate the parent diploid Medicago sativa and tetraploid alfalfa and shaken progeny. Improve the affinity, overcome the distant hybridization, access to hybrid success. The group selection method of breeding, after 16 years, bred for the first time “Longmu 801” and “Longmu 803” new varieties of alfalfa. Through the variety comparison test, the regional test and the production test result show that the variety has the characteristics of strong resistance and high yield of grass.