Free and peptide amino acid fluxes across the mesenteric and non-mesenteric viscera of sheep and calves

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dc.contributor.authorDiRienzo, Douglas B.en
dc.contributor.committeechairWebb, Kenneth E. Jr.en
dc.contributor.committeememberHerbein, Joseph H. Jr.en
dc.contributor.committeememberKornegay, Ervin T.en
dc.contributor.committeememberAkers, Robert Michaelen
dc.contributor.committeememberMcGrath, Charles J.en
dc.contributor.committeememberThye, Forrest W.en
dc.contributor.departmentAnimal Scienceen
dc.date.accessioned2014-03-14T21:21:09Zen
dc.date.adate2005-10-13en
dc.date.available2014-03-14T21:21:09Zen
dc.date.issued1992-09-05en
dc.date.rdate2005-10-13en
dc.date.sdate2005-10-13en
dc.description.abstractThe flux of free and peptide amino acids across the stomach and intestinal tissues was quantified using sheep and calves maintained in "steady stateā€ conditions by feeding at hourly intervals. Crossbred wethers and Holstein steers were surgically cannulated in the abdominal aorta, mesenteric vein and portal vein. All animals were fed an orchardgrass, corn, SBM-based diet. The steers received three abomasal infusions; a control solution, and an amino acid mixture simulating casein and casein each at a rate equivalent to 25% of daily crude protein intake. Nutrient fluxes from the mesenteric and portal-drained viscera were measured; non-mesenteric flux was calculated as the difference between portal flux and mesenteric flux. Results of this study support the concept that free amino acids are absorbed by the small intestine and not by the stomach. The flux of peptide amino acids across the portal-drained-viscera indicate that a major portion of the amino acids which are absorbed by cattle and sheep are absorbed in the form of peptides from the stomach. The observation that large quantities of peptide amino acids are absorbed from the stomach is unique and it is expected that this most important discovery will revolutionize the feeding of ruminants.en
dc.description.degreePh. D.en
dc.format.extentviii, 129 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10132005-152549en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10132005-152549/en
dc.identifier.urihttp://hdl.handle.net/10919/39841en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1992.D574.pdfen
dc.relation.isformatofOCLC# 26248100en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1992.D574en
dc.subject.lcshAmino acids -- Metabolismen
dc.subject.lcshCalves -- Feed utilization efficiencyen
dc.subject.lcshSheep -- Feed utilization efficiencyen
dc.subject.lcshVisceraen
dc.titleFree and peptide amino acid fluxes across the mesenteric and non-mesenteric viscera of sheep and calvesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineAnimal Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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