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Substrates (arabinogalactan (AG), cellulose, fructo-oligosaccharide (FOS), inulin, mucin, citrus pectin and resistant starch) were fermented <jats:italic>in vitro<\/jats:italic> (ileal 2 h and caecal 24 h) with an ileal or caecal inoculum prepared from ileal or caecal digesta collected from growing pigs (<jats:italic>n<\/jats:italic> 5) fed a human-type diet for 15 d. The organic matter (OM) fermentability and production of organic acids were determined. In general, there was considerable <jats:italic>in vitro<\/jats:italic> ileal fermentation of fibre, and the substrates differed (<jats:italic>P<\/jats:italic> &lt; 0\u00b7001) for both <jats:italic>in vitro<\/jats:italic> ileal and caecal OM fermentability and for organic acid production. Pectin had the greatest <jats:italic>in vitro<\/jats:italic> ileal OM fermentability (26 %) followed by AG, FOS and resistant starch (15 % on average), and cellulose, inulin and mucin (3 % on average). The fermentation of FOS, inulin and mucin was greater for <jats:italic>in vitro<\/jats:italic> caecal fermentation compared with the ileal counterpart (<jats:italic>P<\/jats:italic> \u2264 0\u00b705). In general, the organic acid production was higher for <jats:italic>in vitro<\/jats:italic> caecal fermentation (<jats:italic>P<\/jats:italic> \u2264 0\u00b705). For instance, the <jats:italic>in vitro<\/jats:italic> ileal acetic acid production represented 4\u201346 % of <jats:italic>in vitro<\/jats:italic> caecal production. Energy from fibre fermentation of 0\u00b76\u201311 kJ\/g substrate fermented could be expected in the ileum of the pig. In conclusion, substrates are fermented in both the ileum and caecum. The degree of fermentation varies among substrates, especially for <jats:italic>in vitro<\/jats:italic> ileal fermentation.<\/jats:p>","DOI":"10.1017\/s0007114520003542","type":"journal-article","created":{"date-parts":[[2020,9,11]],"date-time":"2020-09-11T04:49:49Z","timestamp":1599799789000},"page":"998-1006","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":13,"title":["<i>In vitro<\/i> ileal and caecal fermentation of fibre substrates in the growing pig given a human-type diet"],"prefix":"10.1017","volume":"125","author":[{"given":"Carlos A.","family":"Montoya","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"Blatchford","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul 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