The body temperature of healthy pigs is generally 38-40 degrees Celsius, and the temperature of pig carcasses just after slaughter will increase by 1-2 degrees. This temperature is most suitable for the growth and reproduction of microorganisms, and causes rapid decay of the carcasses. In order to prevent corruption, it is necessary to quickly reduce the body temperature to 0-4 degrees, so that the preservation period of fresh meat can be extended. During the cooling process, the meat matures synchronously. This kind of meat is called cooling meat. Cooled meat should be hung and stored in a 0-1 degree cooling room. The storage period should not exceed 9 days.