Abstract: Broussonetia papyrifera (stems and leaves) contains abundant protein,which can serve as a plant-based protein source to replace part of the soybean meal in livestock and poultry diets,feeding a variety of animals with high nutritional value.In 2018,the stems and leaves of Broussonetia papyrifera were included in the Catalogue of Feed Raw Materials, drawing widespread attention to its feeding value.Additionally,Broussonetia papyrifera is also a traditional Chinese medicinal herb,with its fruits (Fructus Broussonetiae),leaves,and root bark all having medicinal properties.Broussonetia papyrifera possess medicinal effects such as enhancing the immunity of animals,regulating fat metabolism,and resisting chicken coccidiosis,gradually attracting the attention of researchers for its medicinal value.Previous studies on the active ingredients of Broussonetia papyrifera have mainly focused on flavonoids,alkaloids,lignans,etc.,with less attention paid to the activity of polysaccharides.The polysaccharides from Broussonetia papyrifera have rich biological activities such as antioxidant,antimicrobial,hepatoprotective,and immune enhancing properties.Under the regulations prohibiting the addition of antibiotics in animal feed and reducing the use of antibiotics during feeding,polysaccharides from Broussonetia papyrifera may be developed into a functional feed with broad application prospects in the livestock industry.The author comprehensively reviews the extraction processes,structural characterization and biological activities of polysaccharides from Broussonetia papyrifera,analyzes and summarizes the current research hotspots and deficiencies in this field,aiming to provide theoretical references for further development and utilization of polysaccharides from Broussonetia papyrifera in livestock and poultry production.

Key words: polysaccharides from Broussonetia papyrifera; extraction process; structural characterization; biological activity