一引言我国西北各省,畜牧发达,乳类产量极丰。甘肃省年产牛乳约一千七百万斤,新宁青各省虽无统计数字,然估计其数量,当较甘肃尤多。西北之乳产,除牛乳外,尚有马乳及羊乳。西北羊之数额,不下五千万头,约占世界之第三或第四位;故羊乳产量,为数亦甚可觀。马乳除哈萨克人等嗜食酸马奶外,汉人用者不多。牛乳,以蒙藏同胞各地区,所产为多。食用不尽者,即以提制乳油(俗称酥油),以行销各地。至于提过乳油之乳液,除用以制乾酪而供食用外,无适当之用途。惟有各都市之牛奶 I. INTRODUCTION The provinces of northwestern China have developed livestock husbandry and produce very rich milk. Gansu Province, with an annual output of about 17 million catties of milk, the new Ning Qing provinces, although no statistics, then estimate the number, especially when more than Gansu. Northwest milk production, in addition to milk, there are still milk and goat milk. The amount of sheep in the northwest is no less than 50 million heads, accounting for about the third or fourth place in the world. Therefore, the output of goat milk is also impressive. Horse milk in addition to Kazakh and other addicted yogurt, the Han few users. Milk, to Mongolian and Tibetan compatriots in various regions, produced more. Lack of food, that is, to make EC (commonly known as butter) to marketing all over. As for emulsions which have been mentioned as emulsifiable concentrates, there is no proper use except for making cheese for food. Only milk in all the cities