{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T12:44:58Z","timestamp":1789994698379,"version":"4.0.1"},"reference-count":27,"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":6156,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br J Nutr"],"published-print":{"date-parts":[[1990,5]]},"abstract":"<jats:p>The selective retention of particles in the reticulo-rumen and in the gastrointestinal tract distal to the reticulo-rumen was studied in fistulated sheep maintained on a roughage diet. Polyethylene glycol and plastic particles of different lengths (1 and 10 mm) and densities (092, 1.03, 1.22 and 1.44 g\/ml) were either fed or were introduced into the omasum. The mean retention time in the reticulo-rumen (MRT<jats:sub>RR<\/jats:sub>) of 1 mm long particles with a density of approximately 1.0 g\/ml was about 67 h, that is eight times longer than the MRT<jats:sub>RR<\/jats:sub> of fluid; the heavier particles were retained only three times longer than fluid. Particles with a length of 10 mm were retained in the reticulo-rumen 19\u201328 h longer than 1 mm long particles of the same density. Particles with a length of 10 mm were reduced to smaller particles (0.5\u20134 mm) due to rumination. Multiple regression analysis indicated that particle density and particle size accounted for 59 and 28% of the total variation of MRT<jats:sub>RR<\/jats:sub> respectively. The mean retention time distal to the reticulo- rumen (MRT<jats:sub>Gut<\/jats:sub>) of 1 and 10 mm long particles with a density near 1.0 g\/ml was 18\u201319 h, similar to that of fluid (16 h). The heavier particles were retained about 3\u20138 h longer.<\/jats:p>","DOI":"10.1079\/bjn19900133","type":"journal-article","created":{"date-parts":[[2005,9,17]],"date-time":"2005-09-17T00:07:20Z","timestamp":1126915640000},"page":"457-465","source":"Crossref","is-referenced-by-count":61,"title":["The effect of size and density on mean retention time of particles in the gastrointestinal tract of sheep"],"prefix":"10.1017","volume":"63","author":[{"given":"M.","family":"Kaske","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"W. V.","family":"Engelhardt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2007,3,9]]},"reference":[{"key":"S0007114590000538_ref023","first-page":"498","volume-title":"Control of Digestion and Metabolism in Ruminants","author":"Ulyatt","year":"1986"},{"key":"S0007114590000538_ref017","doi-asserted-by":"publisher","DOI":"10.1017\/S0021859600028859"},{"key":"S0007114590000538_ref012","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(57)94516-2"},{"key":"S0007114590000538_ref009","first-page":"139","article-title":"A turbidimetric method of the determination of higher polyethylene glycols in biological material","volume":"22","author":"Hyd\u00e8n","year":"1955","journal-title":"Kungliga Lanibruksh\u00f6gskolans Annaler"},{"key":"S0007114590000538_ref008","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(85)80945-0"},{"key":"S0007114590000538_ref016","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(87)80224-2"},{"key":"S0007114590000538_ref003","unstructured":"Durkwa L. (1983). Length and specific gravity of particles passed from the rumen and changes in ingesta specific gravity. PhD Thesis, University of Vermont, Burlington."},{"key":"S0007114590000538_ref002","doi-asserted-by":"publisher","DOI":"10.2527\/jas1984.592470x"},{"key":"S0007114590000538_ref019","first-page":"43","volume-title":"Comparative Aspects of Physiology of Digestion in Ruminants","author":"Sutherland","year":"1988"},{"key":"S0007114590000538_ref021","doi-asserted-by":"publisher","DOI":"10.1017\/S0003356100026295"},{"key":"S0007114590000538_ref018","first-page":"173","article-title":"The physical breakdown of feed during digestion in the rumen","volume":"31","author":"Reid","year":"1977","journal-title":"Proceedings of the New Zealand Society of Animal Production"},{"key":"S0007114590000538_ref025","doi-asserted-by":"publisher","DOI":"10.2527\/jas1982.544885x"},{"key":"S0007114590000538_ref026","doi-asserted-by":"publisher","DOI":"10.2527\/jas1978.461309x"},{"key":"S0007114590000538_ref001","doi-asserted-by":"publisher","DOI":"10.1079\/BJN19620049"},{"key":"S0007114590000538_ref027","volume-title":"Statistical Principles in Experimental Design","author":"Wincr","year":"1971"},{"key":"S0007114590000538_ref005","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(86)80439-8"},{"key":"S0007114590000538_ref006","doi-asserted-by":"publisher","DOI":"10.1079\/BJN19730114"},{"key":"S0007114590000538_ref013","doi-asserted-by":"publisher","DOI":"10.1079\/BJN19850065"},{"key":"S0007114590000538_ref010","unstructured":"Kaske M. (1987). Die Retention von Partikeln unterschiedlicher Dichte und Gr\u00f6Be im Retikulorumen von Schafen. Inaugural-Dissertation, Hannover."},{"key":"S0007114590000538_ref022","first-page":"103","volume-title":"Fibre in Human and Animal Nutrition","author":"Ulyatt","year":"1983"},{"key":"S0007114590000538_ref011","doi-asserted-by":"publisher","DOI":"10.1079\/BJN19880137"},{"key":"S0007114590000538_ref004","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(84)81354-5"},{"key":"S0007114590000538_ref014","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(86)80626-9"},{"key":"S0007114590000538_ref015","volume-title":"Agrikulturchemische Untersuchungsmethoden. (Agricultural-chemical examination methods.)","author":"Nehring","year":"1960"},{"key":"S0007114590000538_ref007","first-page":"190","article-title":"A method to determine specific gravity of rumen digesta or of forage samples incubated in nylon bags","author":"Hooper","year":"1984","journal-title":"Canadian Society of Animal Science, Occasional Publication"},{"key":"S0007114590000538_ref024","first-page":"351","volume-title":"Digestion and Metabolism in the Ruminant","author":"Van soest","year":"1975"},{"key":"S0007114590000538_ref020","doi-asserted-by":"publisher","DOI":"10.1051\/rnd:19780203"}],"container-title":["British Journal of Nutrition"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S0007114590000538","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,5,18]],"date-time":"2019-05-18T17:24:35Z","timestamp":1558200275000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/S0007114590000538\/type\/journal_article"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1990,5]]},"references-count":27,"journal-issue":{"issue":"3","published-print":{"date-parts":[[1990,5]]}},"alternative-id":["S0007114590000538"],"URL":"https:\/\/doi.org\/10.1079\/bjn19900133","relation":{},"ISSN":["0007-1145","1475-2662"],"issn-type":[{"value":"0007-1145","type":"print"},{"value":"1475-2662","type":"electronic"}],"subject":[],"published":{"date-parts":[[1990,5]]}}}