Regulation of Urea Recycling into the Gastrointestinal Tract and Ammonia Metabolism in Ruminants

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dc.contributor.advisorBequette, Brian Jen_US
dc.contributor.authorSunny, Nishanth Edakulathuren_US
dc.contributor.departmentAnimal Sciencesen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2005-02-02T06:48:18Z
dc.date.available2005-02-02T06:48:18Z
dc.date.issued2004-12-08en_US
dc.description.abstractThe primary objective of this study was to determine the extent ruminants control urea recycling to the gastrointestinal tract (GIT), independent of rumen microbial metabolism. Urea kinetics were determined by continuous infusion of [15N15N]urea (4 levels) to jugular vein of sheep (n = 4; 28.1kg) fed a low protein (6.8%) diet. Although urea recycling to the GIT (P < 0.001) increased with each level of urea, the proportion (P < 0.001) and amount (P < 0.001) of recycled urea returning as ammonia to liver for ureagenesis also increased. In consequence a decreasing proportion (P = 0.003) of recycled urea was used for microbial protein synthesis. The present study suggests that ruminants have a large capacity to partition urea-N to the GIT. Thus, rather than up-regulating urea recycling, there appears to be more potential to improve N efficiency in ruminants by manipulating the rumen environment to optimize capture of recycled N.en_US
dc.format.extent803456 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/2116
dc.language.isoen_US
dc.subject.pqcontrolledAgriculture, Animal Culture and Nutritionen_US
dc.subject.pquncontrolledUrea recyclingen_US
dc.subject.pquncontrolledRuminanten_US
dc.subject.pquncontrolledAmmonia metabolismen_US
dc.titleRegulation of Urea Recycling into the Gastrointestinal Tract and Ammonia Metabolism in Ruminantsen_US
dc.typeThesisen_US

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