A method of promoting or improving the feed efficiency and the muscle to fat ratio in animals by administering to the animals a therapeutically effective amount of a pure or substantially pure RR-isomer of ractopamine is disclosed. Also disclosed are animal feed preparations and compositions and pharmaceutical preparations capable of increasing lean meat deposition in an animal or decreasing body fat, or promoting or improving the growth of an animal or improving the feed efficiency of an animal. Feed preparation, compositions and pharmaceutical preparations including therapeutically effective amounts of a pure or substantially pure RR-isomer of ractopamine are disclosed.
本发明公开了一种通过向动物投与纯或基本纯的RR异构体雷克
多巴胺的治疗有效量来促进或改善动物的饲料效率和肌肉脂肪比的方法。本发明还公开了动物饲料制剂和组成物,以及能够增加动物的瘦肉沉积或减少体脂肪,或促进或改善动物生长或提高动物饲料效率的制药制剂。公开了包括纯或基本纯的RR异构体雷克
多巴胺的治疗有效量的饲料制剂、组成物和制药制剂。