Bottled fresh milk in Yang Da is pasteurized, and its shelf life is 3 days, so it needs to be stored at 2-6℃. Yang Da dairy industry is a scientific and technological industry of Gaoyou Yangzhou University Experimental Farm. Based on the scientific and technological advantages of colleges and universities, it takes the road of combining Industry-University-Research. With the experimental farm coming from 1952, Yang Da dairy industry has been growing and becoming the largest dairy producer in Yangzhou. Now it has registered trademarks such as "Sunong", "Yangnong" and "Yang Da".

Pasteurization, also known as pasteurization, is based on its inventor, French biologist Louis? Pasteur. 1862, Pasteur invented a disinfection method that can kill germs in milk without affecting the taste of milk, that is, pasteurization.

In a certain temperature range, the lower the temperature, the slower the bacterial reproduction; The higher the temperature, the faster the reproduction. But if the temperature is too high, the bacteria will die. Different bacteria have different optimum growth temperature and heat and cold tolerance. In fact, pasteurization is to use the characteristics of bacteria that are not very heat-resistant, and treat them with appropriate temperature and heat preservation time to kill them all. However, a small amount of harmless or beneficial bacteria or bacterial spores remain after pasteurization, so pasteurized milk should be stored at about 4℃, and it can only be stored for 3 ~ 16 days at most.