3. Milk with different nutritional values is rich in minerals, calcium, phosphorus, iron, zinc, copper, manganese and molybdenum. The most rare thing is that milk is the best source of calcium for human body, and the ratio of calcium to phosphorus is very suitable, which is beneficial to the absorption of calcium. Raw milk can decompose lactose and protein in milk, which is more easily digested and absorbed by human body; Has the effects of promoting gastric juice secretion, stimulating appetite, and promoting and strengthening digestion; Lactic acid bacteria can reduce the production of some carcinogens, so it has anti-cancer effect; It can inhibit the reproduction of spoilage bacteria in intestinal tract and weaken the toxin produced by spoilage bacteria in intestinal tract; Has the function of lowering cholesterol, and is especially suitable for people with hyperlipidemia. 4. Different kinds of milk are generally pasteurized and refrigerated at 4℃ ~ 10℃. Raw milk can not use milk containing antibiotics, otherwise lactic acid bacteria will be eliminated by antibiotics.