{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T13:43:17Z","timestamp":1787838197956,"version":"build-2784847793"},"reference-count":107,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2019,1,7]],"date-time":"2019-01-07T00:00:00Z","timestamp":1546819200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Morphology"],"published-print":{"date-parts":[[2019,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The omasum is the third forestomach compartment of pecoran ruminants. It is assumed that the re\u2010absorption of fluid present in the forestomach digesta (that facilitates particle sorting, digestion, and harvest of microbes) is its main function, so that less diluted digesta is submitted to enzymatic digestion in the lower digestive tract. Here, we evaluate measures of omasum size (representing 84 ruminant species in the largest data set) against body mass and proxies of the natural diet (%grass) or forestomach physiology (fluid throughput), using phylogenetically controlled models. The origin of specimens (free\u2010ranging or captive) did not have an effect in the data set. Models with the best support invariably either included %grass or a physiology proxy in addition to body mass. These effects were not necessarily additive (affecting the intercept of the allometric regression), but often indicated a change in the allometric body mass\u2010exponent with diet or physiology. Only models that allowed an influence on the allometric exponent yielded basic exponents compatible with predictions derived from geometry. Species that include more grass in their natural diet, or that have a \u201ccattle\u2010type\u201d physiology marked by a high forestomach fluid throughput, generally have larger omasa. However, the existence of outliers, as well as the overall data pattern, suggest that this is not an obligatory morphophysiological condition. Circumstantial evidence is presented leading to the hypothesis that the comparatively small and less complex omasa of \u201cmoose\u2010type\u201d species do not necessarily represent an \u201coriginal\u201d state, but may be derived from more complex states by ontogenetic reduction and fusion of omasal laminae.<\/jats:p>","DOI":"10.1002\/jmor.20942","type":"journal-article","created":{"date-parts":[[2019,1,8]],"date-time":"2019-01-08T21:47:29Z","timestamp":1546984049000},"page":"259-277","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Comparative omasum anatomy in ruminants: Relationships with natural diet, digestive physiology, and general considerations on allometric investigations"],"prefix":"10.1002","volume":"280","author":[{"given":"Christian","family":"Ehrlich","sequence":"first","affiliation":[{"name":"Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty University of Zurich  Zurich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daryl","family":"Codron","sequence":"additional","affiliation":[{"name":"Florisbad Quaternary Research Department National Museum  Bloemfontein South Africa"},{"name":"Centre for Environmental Management University of the Free State  Bloemfontein South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reinhold R.","family":"Hofmann","sequence":"additional","affiliation":[{"name":"Trompeterhaus  Baruth\/Mark Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J\u00fcrgen","family":"Hummel","sequence":"additional","affiliation":[{"name":"Ruminant Nutrition, Department of Animal Sciences University of Goettingen  Goettingen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3841-6207","authenticated-orcid":false,"given":"Marcus","family":"Clauss","sequence":"additional","affiliation":[{"name":"Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty University of Zurich  Zurich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,1,7]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1515\/mammalia-2014-0129"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0952836902000614"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.4141\/cjas86-072"},{"key":"e_1_2_6_5_1","first-page":"504","article-title":"Early development and function of the bovine stomach","volume":"35","author":"Becker R. 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