There is a difference between milk 3.2 and 3.8. This data refers to the protein content. Milk containing 3.8g per 100ml is higher than that containing 3.2g, and the quality is better. But in fact, 3.9g milk is more expensive than 3.2g milk in protein.

The protein content of good quality fresh milk can reach more than 4%, ranging from 2.8 to 4.6 according to different regions, seasons, feed and cattle conditions. Now they are all automatic milking machines. After the pipeline is cleaned and disinfected, there will be residual water inside. After milking, the milk in the pipeline should also be pushed into the refrigerator or refrigerated truck with water.

The protein content of milk is about 2.8 ~ 3.4%, and adults can generally drink about 250 ~ 300ml of milk every day, which is a cup in an ordinary cup. This is not only harmless to health, but also helpful to keep healthy. In addition, it should be noted that if you are in the developmental stage and pregnant period with a large demand for calcium, you can appropriately increase the intake of milk, but you should also be careful not to exceed 1000 ml.

Milk 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. There are at least 100 complex species, and the main components are water, fat, phospholipids, protein, lactose and inorganic salts.

Refer to the above? Baidu encyclopedia-milk