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dc.contributor.authorDalley, D. E.
dc.contributor.authorIsherwood, Peter
dc.contributor.authorSykes, Andrew R.
dc.contributor.authorRobson, Alexander B.
dc.date.accessioned2009-03-11T22:44:37Z
dc.date.issued1996-10
dc.identifier.issn1173-8405en
dc.identifier.urihttps://hdl.handle.net/10182/887
dc.description.abstractSixteen 2-year old female sheep were fitted with rumen and duodenal cannulae at the Johnstone Memorial Laboratory, Lincoln University during 1989-1990. They were offered, at 2 hourly intervals, a pelleted concentrate diet (900 g/day) and chaffed lucerne hay (100 g/day). In a split plot experiment they were infused, intraruminally and at four rates, with potassium (providing 16, 26, 36 or 46 g K/kg food DM/day) and magnesium (providing 1.3, 1.8, 2.3 or 3.1 g Mg/kg food DM/day) within a latin square design and with the liquid and solid phase markers ⁵¹Chromium EDTA and ¹⁴¹Cerium chloride. Net absorption of Mg before and after the duodenum was estimated from dietary intake, duodenal flow and urinary and faecal excretion of Mg. Increasing K intake resulted in a decline in net absorption of Mg from the entire digestive tract, supporting data in the literature. Increasing K intake from 16 to 46 g/kg DM decreased urinary Mg excretion by between 0.14 and 0.30 g/day, the extent of which was independent of the level of Mg intake. At high K intake Mg absorption from the rumen was reduced, the amount absorbed ranging from 0.08 g Mg/day at intakes of 1.3 g Mg/day and 16 g K/kg DM/day to 0.46 g Mg/day at intakes of 3.1 g Mg/day and 16 g K/kg DM/day. However, at high K intake, and when Mg absorption from the rumen was reduced, net Mg absorption from sites distal to the rumen was increased to an extent which suggested compensatory absorption. Increase in K intake was associated with a consistent reduction in plasma Mg concentration which was independent of Mg intake. Increases in Mg intake resulted in increases in Mg absorption and plasma Mg concentration at all rates of K intake in direct proportion to rate of intake. The reduction in Mg absorption from the rumen at high K intake was associated with an increase (0.3 units) in pH of rumen digesta.en
dc.format.extent1-14en
dc.language.isoen
dc.publisherLincoln University. Centre for Computing and Biometrics
dc.relationThe original publication is available from - Lincoln University. Centre for Computing and Biometrics - http://hdl.handle.net/10182/887en
dc.relation.ispartofseriesApplied Computing Research Reporten
dc.subjectpotassiumen
dc.subjectmagnesium absorptionen
dc.subjectsheepen
dc.titleEffect of intraruminal infusion of potassium on the site of magnesium absorption within the digestive tract in sheepen
dc.typeMonograph
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300400 Animal Production::300403 Animal nutrition
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300400 Animal Production::300406 Animal growth and development
lu.contributor.unitLincoln University
lu.contributor.unitFaculty of Agriculture and Life Sciences
lu.contributor.unitDepartment of Agricultural Sciences
dc.subject.anzsrc140201 Agricultural Economicsen
pubs.editionNo. 10en
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/AGSC
pubs.publication-statusPublisheden
pubs.publisher-urlhttp://hdl.handle.net/10182/887en
dc.publisher.placeLincoln, Canterburyen


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