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For this study, 90 healthy crossbred fatteners were selected and randomly divided into five groups: the control group was fed with a basal diet (Con); experimental group I was fed with basal diet + 40 mg\/kg boric acid (BA); experimental group II was fed with basal diet + 40 mg\/kg boric acid + 400 mg\/kg Astragalus polysaccharides (BA+APS); experimental group III was fed with basal diet + 40 mg\/kg boric acid + 200 mg\/kg Ganoderma lucidum polysaccharides (BA+GLP); and experimental group IV was fed with basal diet + 40 mg\/kg boric acid + 500 mg\/kg Echinacea polysaccharides (BA+EPS). Compared with Con, the average daily gain (ADG), the trypsin activities in the duodenum and jejunum, the IL-2 levels in the spleen, the T-AOC activities and GSH-Px contents in the lymph node of fattening were increased in the BA group (p &lt; 0.05), but malondialdehyde content in the lymph and spleen, and the contents of NH3, H2S, Hg, Cu, Fe and Zn in the feces and urine were decreased (p &lt; 0.05). Compared with the BA, the ADG, gain-to-feed ratio (G\/F), the trypsin and maltase activities in the duodenum and jejunum were increased in the BA+APS (p &lt; 0.05), and the T-SOD activities in the spleen and T-AOC activities in the lymph node were also increased (p &lt; 0.05), but the H2S level was decreased in the feces and urine (p &lt; 0.05). Compared with the BA, the ADG, G\/F and the trypsin and maltase activities in the duodenum were increased in the BA+GLP and BA+EPS (p &lt; 0.05), the activities of maltase and lipase in the duodenum of fatteners in the BA+GLP and the activities of trypsin, maltase and lipase in the BA+EPS were increased (p &lt; 0.05). Gathering everything together, our findings reveal that the combined addition of boric acid and plant polysaccharides in the diet of fatteners synergistically improved their growth performance and immune status. That may be achieved by regulating the activity of intestinal digestive enzymes, improving the antioxidant function and then promoting the digestion and absorption of nutrients. Furthermore, the above results reduce the emission of harmful gases and heavy metals in feces and urine.<\/jats:p>","DOI":"10.3390\/ani14111515","type":"journal-article","created":{"date-parts":[[2024,5,21]],"date-time":"2024-05-21T08:54:28Z","timestamp":1716281668000},"page":"1515","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Effects of Plant Polysaccharides Combined with Boric Acid on Digestive Function, Immune Function, Harmful Gas and Heavy Metal Contents in Faeces of Fatteners"],"prefix":"10.3390","volume":"14","author":[{"given":"Juan","family":"Deng","sequence":"first","affiliation":[{"name":"College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1978-3821","authenticated-orcid":false,"given":"Feng","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China"},{"name":"Anhui Province Key Laboratory of Animal Nutrition Regulation and Health, Chuzhou 233100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoran","family":"Fan","sequence":"additional","affiliation":[{"name":"College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuxuan","family":"Zheng","sequence":"additional","affiliation":[{"name":"College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chunfang","family":"Zhao","sequence":"additional","affiliation":[{"name":"College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China"},{"name":"Anhui Province Key Laboratory of Animal Nutrition Regulation and Health, Chuzhou 233100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Man","family":"Ren","sequence":"additional","affiliation":[{"name":"College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China"},{"name":"Anhui Province Key Laboratory of Animal Nutrition Regulation and Health, Chuzhou 233100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5477-5317","authenticated-orcid":false,"given":"Erhui","family":"Jin","sequence":"additional","affiliation":[{"name":"College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China"},{"name":"Anhui Province Key Laboratory of Animal Nutrition Regulation and Health, Chuzhou 233100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Youfang","family":"Gu","sequence":"additional","affiliation":[{"name":"College of Animal Science, Anhui Science and Technology University, Chuzhou 233100, China"},{"name":"Anhui Province Key Laboratory of Animal Nutrition Regulation and Health, Chuzhou 233100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,5,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Du, D., Zhou, J., Zhang, K., and Zhi, S. 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