Nowadays, pig production faces two major challenges: one is to maintain the health of pigs, and the other is to ensure the continued high production performance of pigs. These two challenges are sometimes contradictory, but the pig's healthy gut and optimal growth performance are a balanced and unified relationship, and dietary fiber can help improve intestinal health. Modern livestock are usually fed high-concentration, high-nutrient diets to meet nutritional needs. However, highly concentrated feeds do not meet the physiological needs of animals, they also require dietary fiber to maintain the health and digestion of the body. Functional fibers have a limited effect on growing pigs. Fiber optimizes nutrient efficiency and controls the time of food transfer, but nutrients are not supplied simultaneously. The response of growing pigs to different specific forms of fiber is not consistent. Most of the fiber feed is fed prenatally to the sow, helping to prevent breast edema and mastitis - metritis - no milk syndrome. Importantly, fiber prevents constipation. Fiber also affects restaurant emptying time and helps keep the gut flora healthy. Fiber diets are also often used to feed sows to achieve fullness without becoming too fat. Adding low levels of high quality fiber to the feed is unlikely to reduce the energy intake of the sow, but it will increase the transit time of the restaurant. The sow's digestive tract fermenting ability is stronger than that of growing pigs, especially for crude fiber. Fiber intake also has a lot of room and is easy to compensate, especially when the intestines need to be filled during pregnancy. Designing a "fiber" formula is still difficult because it is not a true nutrient. The amount of crude fiber in the diet of piglets and sows should be less than 2.5% (low crude fiber content) and 4% to 6% (including known ingredients such as lower leg feed, bran, and bran powder). The use of dietary fiber lacks analysis of its ingredients, including resistant starch. Unfortunately, most studies are related to human nutrition and health, so it is difficult to infer the nutritional function of fiber on pigs. Wuxi Winsun Automation Instrument Co., Ltd , https://www.winsunwx.com