{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,12]],"date-time":"2026-02-12T11:19:48Z","timestamp":1770895188208,"version":"3.50.1"},"reference-count":33,"publisher":"Cambridge University Press (CUP)","issue":"3","license":[{"start":{"date-parts":[[2007,3,9]],"date-time":"2007-03-09T00:00:00Z","timestamp":1173398400000},"content-version":"unspecified","delay-in-days":2564,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br J Nutr"],"published-print":{"date-parts":[[2000,3]]},"abstract":"<jats:p>An experiment was conducted to investigate the compartmental mean residence time, (CMRT) of feed residues in segments of gastrointestinal digesta of mature Holstein steers. The objective was to evaluate assumptions that feed residues flow through ruminal digesta as sequential mixing pools having age-dependent (GN) and age-independent (G1) distributed residence times respectively (GN \u2192 G1 flow). The basal diet was a semi-tropical hay containing 98 g crude protein and 503 g apparently digestible DM per kg DM. The hay was consumed and feed residues of different size and\/or previous digestion from the hay were inserted into the reticulo-rumen (rumen) and abomasum. Marker profiles appearing at the duodenum and faeces were fitted to various compartment models to estimate CMRT. Post-abomasal CMRT did not differ among solutes or feed residues of different size and previous digestion and constituted only 5\u00b78 % of the CMRT for the entire gastrointestinal tract. Markers initially applied to orally or ruminally dosed feed residues exhibited profiles in duodenal digesta and faeces conforming to GN \u2192 G1 flow. Previously undigested, masticated feed residues inserted into the dorsal rumen digesta had longer ruminal CMRT in the GN pool but not the G1 pool than did similarly inserted faecal small particles or normally ingested hay. These results support model assumptions of GN \u2192 G1 flow within rumen digesta. The results support mechanisms proposed for the GN pool as the \u2018lag-rumination pool\u2019 and the G1 pool as the \u2018mass action turnover pool\u2019. If further validated, rumen CMRT in cattle could be estimated from marker profiles in more easily obtained faeces to estimate ruminal CMRT required for feed evaluation systems.<\/jats:p>","DOI":"10.1017\/s0007114500000374","type":"journal-article","created":{"date-parts":[[2017,2,20]],"date-time":"2017-02-20T11:26:05Z","timestamp":1487589965000},"page":"295-306","source":"Crossref","is-referenced-by-count":29,"title":["The flow of forage particles and solutes through segments of the digestive tracts of cattle"],"prefix":"10.1017","volume":"83","author":[{"given":"M. J.","family":"Wylie","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W. C.","family":"Ellis","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. H.","family":"Matis","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"E. M.","family":"Bailey","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"W. D.","family":"James","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"D. E.","family":"Beever","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2007,3,9]]},"reference":[{"key":"S0007114500000374_ref007","first-page":"682","volume-title":"Forage Quality, Evaluation, and Utilization","author":"Ellis","year":"1994"},{"key":"S0007114500000374_ref020","doi-asserted-by":"publisher","DOI":"10.2527\/1994.721201x"},{"key":"S0007114500000374_ref032","unstructured":"Wylie MJ (1987) The flow of feed residues through the gastrointestinal tract of ruminants. 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In Nutritional Ecology of Herbivores: Posters, Plenary Discussions and Papers presented at Satellite Symposia and Seminar held in conjunction with the Vth Symposium on the Nutrition of Herbivores, San Antonio, TX, April 10\u201316, 1999. CD-ROM available from WC Ellis, Department of Animal Science, Texas A & M University, TX 77843. 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