Phosphorus and calcium extraction from bone digestion in the rumen of sheep (Ovis aries)

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dc.contributor.advisor Mitchell, Graham en
dc.contributor.advisor Skinner, J.D. (John Dawson), 1932- en
dc.contributor.postgraduate Bredin, Ian Peter en
dc.date.accessioned 2013-09-06T17:10:38Z
dc.date.available 2007-05-04 en
dc.date.available 2013-09-06T17:10:38Z
dc.date.created 2006-11-24 en
dc.date.issued 2007-05-04 en
dc.date.submitted 2007-05-04 en
dc.description Dissertation (MSc (Veterinary Sciences))--University of Pretoria, 2007. en
dc.description.abstract Sheep were used to model the digestion of bone in the rumen. The model of ruminal bone digestion was used to identify a possible source of phosphorus and calcium for ruminants, with particular focus on giraffes. The daily requirements for phosphorus and calcium by giraffes to sustain skeletal growth and maintenance are large. The source of sufficient calcium is browse. The source of necessary phosphorus is obscure, but it could be via osteophagia, a frequently observed behaviour in giraffes. The possibility of ingested bone being digested in the rumen was assessed. Bone samples from cancellous and dense bones were immersed in distilled water, artificial saliva, and in the rumens of five sheep, for a period of up to 30 days. Distilled water had no effect on bones. Dense (metacarpal shaft) bone samples were softened by exposure to saliva and rumen fluid, but neither calcium nor phosphorus concentration was affected. Cancellous (cervical vertebrae) bone samples also softened and the mass and volume of the samples decreased over the period, especially as a result of exposure to saliva, but they also lost little calcium and phosphorus. In conclusion the use of sheep to model the possible rumen digestion of bone established that although saliva and rumen fluid can soften ingested bones, it is unlikely that ingested bone provides any significant source of minerals while in the rumen, for giraffes and ruminants in general. en
dc.description.availability unrestricted en
dc.description.department Production Animal Studies en
dc.identifier.citation Bredin, I 2006, Phosphorus and calcium extraction from bone digestion in the rumen of sheep (Ovis aries), MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/24319 > en
dc.identifier.upetdurl http://upetd.up.ac.za/thesis/available/etd-05042007-180754/ en
dc.identifier.uri http://hdl.handle.net/2263/24319
dc.language.iso en
dc.publisher University of Pretoria en_ZA
dc.rights © 2006, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. en
dc.subject Giraffe (Giraffa camelopardalis) en
dc.subject Phosphorus en
dc.subject Calcium en
dc.subject Osteophagia en
dc.subject UCTD en_US
dc.title Phosphorus and calcium extraction from bone digestion in the rumen of sheep (Ovis aries) en
dc.type Dissertation en


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