Causes and solutions of diarrhea in early weaned piglets

The etiology of postweaning diarrhea in    piglets is complex. Studies in the past 20 years have shown that dietary factors are the main cause of postweaning diarrhea in piglets. The reason is that there are generally a certain number of pathogenic microorganisms (pathogenic Escherichia coli and rotavirus, etc.) in the gastrointestinal tract of ① healthy piglets. ② introduced isolated pathogenic microorganisms into the gastrointestinal tract of unweaned piglets and weaned piglets without supplementation or adequate feeding, but did not cause diarrhea. There is no inevitable relationship between the proliferation of intestinal pathogenic microorganisms in ③ and postweaning diarrhea. Diarrhea can still occur in weaned piglets when ④ exists or proliferates without pathogenic microorganisms. ⑤ weaning did not cause intestinal damage and diarrhea did not occur in piglets, although pathogenic Escherichia coli could still be detected from piglet feces. ⑥ practice has proved that antibiotics are not completely effective in the prevention and treatment of diarrhea in weaned piglets.

The picture shows: sow

   (1) allergic reaction caused by feed protein antigen: Miller et al (1984) first put forward the "diarrhea allergy theory" of early weaned piglets, and people began to have a new understanding of the causes of diarrhea in early weaned piglets. The piglets with less exposure to feed before weaning were more serious after weaning.

   (2) antinutritional factors in feed: antinutritional factors are substances produced by plant metabolism and produce antinutritional effects on animals with different mechanisms. Its main performance is to reduce the utilization rate of nutrients in feed and affect the growth rate and health level of animals.

   antinutritional factors are widespread in the plant kingdom, which is the result of long-term selection in nature.

A plant can contain a variety of anti-nutritional factors, such as soybean contains protease inhibitor, phytohemagglutinin, urease and other anti-nutritional factors. The same anti-nutritional factor can also exist in many plants. For example, tannins exist in sorghum, rape seeds, broad beans and other plants.

As a "biological pesticide",    anti-nutritional factor can protect plants and their seeds from molds, bacteria, viruses and birds, but it is harmful to animals, mainly by reducing the utilization rate of protein.