Feed additive as well as preparation method and application thereof

The invention provides a feed additive as well as a preparation method and application thereof, and belongs to the technical field of feeds. The fermented leek juice is used for preparing the feed additive, the feed additive can participate in production of feed for weaned piglets, and meanwhile, the diarrhea rate and/or the diarrhea index of the weaned piglets are/is reduced, the growth performance of the weaned piglets is improved, and the serum oxidation resistance and the serum immunocompetence of the weaned piglets are improved. And the fermented Chinese chives prepared from the Chinese chives as the feed additive can avoid the problems that people and livestock earn medicines and the like, and is suitable for large-scale popularization and application in the industry. 本发明提供了一种饲料添加剂及其制备方法和应用，属于饲料技术领域。本发明使用发酵韭菜汁制备所述饲料添加剂，能够参与生产断奶仔猪用的饲料，同时降低断奶仔猪腹泻率和/或腹泻指数、提高断奶仔猪生长性能、提高断奶仔猪血清抗氧性以及提高断奶仔猪血清免疫能力。并且韭菜资源丰富，价格较于中草药更加低廉，使用韭菜制备发酵韭菜作为饲料添加剂能够避免人畜挣药等问题，适合在行业里大规模推广使用。