In recent years, with the large-scale development of the pig industry and the rapid development of mechanization, strict selection and breeding of lean-type breeds, sow constipation problems during late pregnancy and postpartum have become increasingly prominent. There are many reasons for constipation in sows. This article analyzes the physiological causes of constipation in sows.

From the physiological point of view, once the sow is pregnant, in order to maintain pregnancy, progesterone secretion will continue to increase, especially in late pregnancy. Progesterone can slow down the contraction of smooth muscle (including uterus and intestinal smooth muscle, etc.), and intestinal motility will be greatly reduced. In addition, the continuous increase of the fetus, squeezing the gastrointestinal tract, and eventually making the feces in the bowel longer, Dry stools, such as abacus beads.

After sows sowing, there is a huge physiological change that causes the sow to become extremely uncomfortable, such as a sudden decrease in intra-abdominal pressure, especially after the digestive organs of pigs have been relieved of squeezing. The function is abnormally active, and the ability to absorb water in the intestinal contents is enhanced. If feeding and management are not scientific, constipation can easily be formed. Therefore, after the sows are delivered, the feeding amount needs to be increased step by step, one to prevent mastitis and the other to prevent constipation.

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