There is also a pig industry in the surrounding areas of Han and Tang Dynasties. For example, in the Biography of Zhu Fu in the Later Han Dynasty, it was said: "In the past, there was a son with a white head in Liaodong, and he offered it differently." To the east of the river, I found that all the pigs were white and pregnant. "The History of the Three Kingdoms, Wei Zhi Dongyi Biography, Northeast Building" says: "Its custom is to raise pigs, eat their meat and dress their skin." In winter, apply pig cream on your body, which is somewhat thick to keep out the cold. "Wei Shi in the Tang Dynasty," The Book of the New Tang Dynasty and the Biography of the Northern Emperor "said:" There are cows that need not be used, and there are giant jackals to eat. "It can be seen that people of all ethnic groups in Northeast China have contributed to the development of pig industry in China. In China, animal husbandry was formed earlier and appeared in the early Western Han Dynasty. Japanese Biography of Historical Records records a series of animal husbandry experts, among which "Keeping the eldest mother as the pig's name" may also have monographs such as "The Book of the Pig", but it has long been lost. Later generations Fang Yizhi once introduced a kind of long-term mother, Qi Yaominshu Pig Raising, to pigs in his Physics Essentials, and said at the beginning: "It is better for sows to have short beaks and no hair." Jia Sixie didn't specify the source, but there is no doubt that this is the way to pull a long face like a pig. From the experience of modern farmers, hairy people have poor physique and slow growth, while unmanned people are the opposite; Those with short mouths eat well, grow fast, have long mouths, and those with many teeth eat poorly, grow slowly, and give birth to piglets, which shows that the ancient pig eating technique is still reasonable. For the choice of pigs, Jia Sixie put forward the method of appearance selection, "* * * eat tapirs, the milk is better, just take them away and don't feed them. "The suckers that piglets often scratch their nipples when nursing milk are more than other piglets, so they grow and develop quickly. ?
The maintenance of newborn piglets has also formed a set of special measures. Piglets born in the cold weather in the Southern and Northern Dynasties and on cold nights in the middle of winter must take good cold protection measures. Qi Yaomin Shu introduces a steaming method, in which piglets are put into a steamer after birth and steamed overnight, and the pot is lightly burned to keep a certain temperature and humidity in the cage. The effect is like an incubator for children in a contemporary maternity hospital, which embodies the wisdom of the ancient working people in China. People also noticed that pigs should be castrated in time during their growth to improve the meat yield and make pork tender. Piglets have weak digestion ability for foraging, so they need to supplement concentrate such as millet and beans. However, due to the lack of concentrated feed, in order to prevent being robbed by big pigs, people adopt the following methods: "Bury the wheels as a feeding ground, sprinkle millet beans inside, and the small finless porpoise has enough food to gain weight quickly." The big pig was kept out. These measures ensure the normal development of piglets. From time to time, ceramic models of sows and suckling piglets have been unearthed in tombs in Xuzhou area, dating back to the Han Dynasty to the end of the Northern Dynasty. For example, the Terracotta Warriors Museum in Xuzhou has two works from the Northern Qi Dynasty. Sows and piglets are made of relief. Sows are fat on the ground, and five or six chubby piglets arch their nipples and feed together. The scene is peaceful and friendly, which can be said to be the evidence of the pig-raising article in Qi Yaomin's Book. In fattening pigs, the method of "fattening dolphins with hemp and salt" was invented in the early Western Han Dynasty. "Huainan Wanbi Book" records: "Take three liters of hemp seeds, live for more than a thousand years, cook them into soup, put one liter of salt in the middle, and feed them with three kinds of bran, and they will be fat." Hemp seed has high oil content (commonly used in later generations to extract oil from hemp seed), which is mashed and cooked, rich in flavor, good in palatability, easy to digest and absorb, and fast in pig weight gain. During the Northern and Southern Dynasties, the method of reducing exercise and increasing weight was also adopted. Qi Yaomin wrote that "a small pen is not too small (a small pen is fat)". The smaller the pigsty, the smaller the activity space, the less exercise and consumption, and the more nutrients are converted into muscle and fat, the faster the fattening will naturally be.