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苜宿(Medicago sativa)在北美大陆是最普及、最重要的饲料作物,它分布于全世界。在加拿大苜宿种植面积大约有5～5.7百万公顷(1.2～1.4千万英亩)。尽管苜蓿有许多优良特性,但是由于存在着气胀病的危险,极大地限制了这个最有价值的豆科牧草在放牧场上进一步利用。牧草气胀病是反刍类动物(牛、羊)采食新鲜的绿色豆科牧草,如苜蓿、红三叶或白三叶后发生的一种病状,是由于新鲜的绿色牧草快速消化而引起的。由气体、泡沫、粘液和部分消化了的植物体颗粒组成的粘稠的起泡
Medicago sativa is the most popular and important feed crop in the North American continent and is distributed throughout the world. About 5 to 5.7 million hectares (1.2-1.4 million acres) of alfalfa plantations in Canada. Despite the many excellent features of alfalfa, the most valuable use of legumes in grazing lands has been greatly limited by the risk of blooms. Blister disease is a symptom of ruminants (cattle, sheep) eating fresh green leguminous pastures such as alfalfa, red clover or white clover due to the rapid digestion of fresh green pastures . A thick blister consisting of gas, foam, mucus and partially digested plant particles