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A total of 320 broiler chicks were randomly allocated to five dietary treatments: normal corn\u2013soyabean (NC) diet group, corn starch diet group, 4 %, 8 % and 12 % RS diet groups. This trial lasted for 42 d. The relative weights of spleen, thymus and bursa, the concentrations of nitric oxide (NO) and IL-4 in plasma at 21 d of age, as well as the activities of total nitric oxide synthase (TNOS) and inducible nitric oxide synthase (iNOS) in plasma at 21 and 42 d of age showed positive linear responses (<jats:italic>P<\/jats:italic> &lt; 0\u00b705) to the increasing dietary RS level. Meanwhile, compared with the birds from the NC group at 21 d of age, birds fed 4 % RS, 8 % RS and 12 % RS diets exhibited higher (<jats:italic>P<\/jats:italic> &lt; 0\u00b705) relative weight of bursa and concentrations of NO and interferon-<jats:italic>\u03b3<\/jats:italic> in plasma. Birds fed 4 % RS and 8 % RS diets showed higher (<jats:italic>P<\/jats:italic> &lt; 0\u00b705) number of IgA-producing cells in the jejunum. While compared with birds from the NC group at 42 d of age, birds fed 12 % RS diet showed higher (<jats:italic>P<\/jats:italic> &lt; 0\u00b705) relative weight of spleen and activities of TNOS and iNOS in plasma. These findings suggested that dietary corn RS supplementation can improve immune function in broilers.<\/jats:p>","DOI":"10.1017\/s0007114522001611","type":"journal-article","created":{"date-parts":[[2022,5,23]],"date-time":"2022-05-23T09:08:45Z","timestamp":1653296925000},"page":"617-626","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":4,"title":["Role of dietary resistant starch in the regulation of broiler immunological 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