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A total of 540 one\u2010day\u2010old yellow\u2010feathered broilers were fed a basal diet without any antibiotic (control group), or a basal diet containing 10 mg\u2009kg<jats:sup>\u22121<\/jats:sup> zinc bacitracin (antibiotic group), or a basal diet supplemented with 10 mg\u2009kg<jats:sup>\u22121<\/jats:sup> CE (CE group). After 63\u2009days of feeding, two broilers per pen were slaughtered to collect tissues for further analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>Results showed that CE increased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) the final body weight and average daily gain from day 1 to 63, and decreased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) the feed\/gain ratio from day 1 to 63. Dietary CE supplementation increased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) plasma total protein, albumin and glucose concentration, and decreased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) urea concentration. CE supplementation increased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) the villus height in the ileum and the villus height\/crypt depth in the jejunum and ileum, but decreased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) the crypt depth in the jejunum and ileum. CE supplementation increased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) most plasma essential AA concentrations. Additionally, CE supplementation upregulated (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05) ASCT1, b<jats:sup>0,+<\/jats:sup>AT, B<jats:sup>0<\/jats:sup>AT1, EAAT3, rBAT, y<jats:sup>+<\/jats:sup>LAT2 and PepT1 expression in the jejunum, and b<jats:sup>0,+<\/jats:sup>AT, EAAT3, rBAT, y<jats:sup>+<\/jats:sup>LAT2, CAT1 and PepT1 in the ileum.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>Collectively, our results indicated that CE supplementation promotes intestinal physiological absorption of AAs by upregulating gene expression of small intestinal key AA and peptide transporters, thereby enhancing the growth performance of broilers. \u00a9 2020 Society of Chemical Industry<\/jats:p><\/jats:sec>","DOI":"10.1002\/jsfa.10525","type":"journal-article","created":{"date-parts":[[2020,5,29]],"date-time":"2020-05-29T05:14:42Z","timestamp":1590729282000},"page":"5126-5135","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Dietary supplementation with citrus extract alters the plasma parameters, circulating amino acid profiles and gene expression of small intestinal nutrient transporters in Chinese yellow\u2010feathered broilers"],"prefix":"10.1002","volume":"100","author":[{"given":"Miao","family":"Yu","sequence":"first","affiliation":[{"name":"Institute of Animal Science, Guangdong Academy of Agricultural Sciences; 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State Key Laboratory of Livestock and Poultry Breeding; Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs; Guangdong Provincial Key Laboratory of Animal Breeding and Nutrition; Guangdong Engineering Technology Research Center of animal Meat quality and Safety Control and Evaluation; Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture  Guangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhimei","family":"Tian","sequence":"additional","affiliation":[{"name":"Institute of Animal Science, Guangdong Academy of Agricultural Sciences; State Key Laboratory of Livestock and Poultry Breeding; Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs; Guangdong Provincial Key Laboratory of Animal Breeding and Nutrition; Guangdong Engineering Technology Research Center of animal Meat quality and Safety Control and Evaluation; Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture  Guangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhichang","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute of Animal Science, Guangdong Academy of Agricultural Sciences; 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