The history of pigs can be traced back to 40 million years ago. Wild boar was first domesticated in China, and the history of raising pigs in China can be traced back to the early and middle Neolithic period.

First, the pre-Qin period.

According to the records of Oracle Bone Inscriptions unearthed in Yin Ruins, pigs were raised in Shang and Zhou Dynasties. Then, with the development of production, the requirement of distinguishing different pigs gradually appeared. One of the great innovations of pig-raising technology in Shang and Zhou Dynasties was the invention of castration technology.

Second, the Han dynasty

With the development of agricultural production, raising pigs is not only for eating, but also for accumulating fertilizer. This situation has promoted the change of pig raising methods. Although there was house feeding before the Han Dynasty, grazing was still the main way to raise pigs until the Han Dynasty. At that time, the relationship between physiological function and external morphology of pigs was recognized in the identification of pig breeds, which played a great role in the breeding of excellent pig breeds in Han Dynasty.

Three. Wei, Jin, southern and northern dynasties

During this period, the combination of house feeding and grazing gradually replaced the feeding method based on grazing. With the development of pig industry and the continuous progress of economy and culture, the experience of raising pigs is increasingly rich.

Fourth, the Tang and Song Dynasties.

After Sui and Tang Dynasties, raising pigs became an important means to increase farmers' income.