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Ensure the growth of animals
Plants are rich in saponins and flavonoids, which can enhance the immune function of the body and promote the growth and development of animal immune organs. Zhao Guoyi found that the supplementation of Scutellaria scutellaria extract in the diet can promote the growth of broilers, increase the feed utilization rate, reduce the ratio of feed to gain, enhance immunity and improve the function of intestinal mucosal barrier. Wang Changwen et al. found that the addition of acanthopanax acanthopanax extract in the diet can improve the serum total antioxidant capacity, improve the anti-stress ability of weaned Suckling calves, enhance immunity, reduce the diarrhea rate and inhibit the propagation of harmful bacteria in the intestine, which can replace antibiotics.
2. Improve the quality of livestock products
Some active ingredients in natural plants can be deposited into animal products to improve the quality of animal products. Adding pine needle powder and garlic to pig diet can make pork more tender and delicious. Adding garlic and pepper to broiler diet can promote chicken appetite, enhance disease resistance and improve meat quality. Adding seaweed powder to the diet of laying hens can increase the iodine content of eggs and deepen the color of yolk. Yao Meilan et al. found that adding seabuckthorn pomace in feed could significantly improve the nutrition and color of yolk. Adding Astragalus extract to the diet of laying hens can improve laying performance and egg quality.

3. Improve feed quality
Natural plants are rich in a variety of nutrients, which can be added to the feed to balance the nutritional content and proportion of the feed, such as protein, amino acid, sugar, starch, fat, minerals, vitamins, major elements and trace elements. Some natural plants can also play the role of correcting the taste of feed, can increase fragrance and deodorant, prevent feed corruption, prolong feed shelf life, such as catechu, hibiscus bark, Chinese prickly ash, white fresh skin, red pepper, etc. There are some natural plants with antibacterial function, such as honeysuckle, forsythia, large green leaves, isatis root, houttuynia, dandelion, etc.