So it tastes good and makes you strong and healthy and keeps. 8 Milk with many bateria tastes bad and does not keep. Bacteria 13 all milk contains some bacteria 14 Milk with few bacteria is of high quality . Milk with many bacteria is of low quality . You get more money for high quality milk.
Some bacteria produce acids and turn the milk sour .
Some bacteria produce gas and spoil your milk. Most bacteria breakdown your milk and reduce the nutrient value. Some bacteria can make you ill or even kill you. Your cattle 20 Healthy udders produce a few bacteria, but only a few. They do not harm your milk.