The performance of sows directly affects the efficiency of raising pigs. In China, whether it is a large-scale pig farm, a small or medium-sized pig farm or a professional farmer, there are different problems in the performance of sows, such as constipation and lack of physical condition. No estrus, delayed estrus, estrus or estrus is not obvious, less lactation. Once the sow is pregnant, in order to reduce the contraction of the uterine smooth muscle to maintain pregnancy, progesterone secretion will continue to increase, especially in the second trimester. Progesterone slows the contraction of smooth muscles (including uterus and gastrointestinal smooth muscles, etc.), so intestinal peristalsis is greatly diminished, and the digestive function of the intestines is greatly diminished. The intestines eventually make the feces in the intestines for too long, and the large intestine absorbs too much water, so that the feces are dry, such as "abacus beads." In addition, the placenta can secrete chorionic gonadotropin after pregnancy, this hormone can inhibit gastric acid secretion, gastric acid is not enough, the digestive enzyme activity in the stomach is reduced, and it also affects the digestion and absorption of gastric acid, so the sow will have appetite Declining, unwilling to exercise, sleepiness and other early pregnancy reactions, these will affect the development of the fetus and even cause dystocia, resulting in greater losses to the farm. The acid preparation can improve the flavor of the feed, mask the bad odor of the feed due to the addition of minerals and vitamins, increase the interest of the sow, and supplement the deficiency of gastric acid secretion caused by pregnancy. However, by adding unprotected acid to the sow's feed, all of the acid is released in the stomach, which in turn inhibits the sow's own ability to secrete acid. Protective acid preparations are also needed to improve the constipation and loss of appetite that are likely to occur during sows during pregnancy. After special processing, the protective acidifier can effectively reduce the release of the acid preparation in the anterior segment of the digestive tract, especially in the stomach, so as not to cause reflex inhibition of gastric acid secretion; the protective acid preparation is mainly released in the posterior segment of the digestive tract. It plays a role, especially to inhibit the growth of harmful bacteria in the back of the digestive tract and promote the growth of beneficial bacteria. It can be seen from Table 2 that the pH value of the ileal chyme changes with time after the addition of the protective acidifying agent in the diet. Gradually decreased, the first day after the intake decreased the most, and after 3 days, it dropped to the lowest point, and then there was an upward trend. Reduces the growth of harmful bacteria by reducing the pH of the chyme in the middle and back of the intestine, Thomas (2002). Protective acidifiers also significantly reduce the amount of E. coli in the gut, and Ravindran (1993) believes that protective acidifiers reduce the amount of pathogenic E. coli in the feces more than any acidulant that has not been treated. The harmful bacteria in the lower part of the intestine are reduced, the number of beneficial bacteria is increased, and the digestion and absorption capacity of the intestines is greatly improved, thereby reducing the possibility of constipation and increasing the amount of lactation during sow breastfeeding. Table 1: Effect of protective acidifier on pH value of ileal chyme in piglets From N. Trottier (1992) The protective acid preparation is mainly released in the intestine, which lowers the pH value of the intestine, reduces the gastric emptying speed reflexively, the food stays longer in the stomach, the chyme and gastric juice mix more fully, and the digestibility of the feed Naturally improved. Decreased pH in the intestine can also promote intestinal peristalsis, reduce the decrease in progesterone secretion, especially the smooth muscle motility caused by late pregnancy, thus greatly reducing the possibility of constipation in late pregnancy.
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