Show simple item record

dc.contributor.authorDalley, D. E.en
dc.contributor.authorIsherwood, Peteren
dc.contributor.authorSykes, Andrew R.en
dc.contributor.authorRobson, Alexander B.en
dc.date.accessioned2008-03-26T22:34:54Z
dc.date.issued1997-08en
dc.identifier.citationDalley, D. E., Isherwood, P., Sykes, A. R., & Robson, A. B. (1997). Effect of intraruminal infusion of potassium on the site of magnesium absorption within the digestive tract in sheep. Journal of Agricultural Science, 129(1), 99-105.en
dc.identifier.issn0021-8596en
dc.identifier.urihttps://hdl.handle.net/10182/383
dc.description.abstractSixteen 2-year old female sheep were fitted with ruminal and duodenal cannulae at Johnstone Memorial Laboratory, Lincoln University during 1989–90. 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 0·07 g Mg/day at intakes of 1·3 g Mg/day and 46 g K/kg DM/day to 0·66 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.extent99-105en
dc.language.isoenen
dc.publisherCambridge University Pressen
dc.relationThe original publication is available from - Cambridge University Pressen
dc.rightsCopyright © 1997 Cambridge University Pressen
dc.subjectsheepen
dc.subjectmagnesium absorptionen
dc.subjectpotassiumen
dc.subjectAgronomy & Agricultureen
dc.titleEffect of intraruminal infusion of potassium on the site of magnesium absorption within the digestive tract in sheepen
dc.typeJournal Article
dc.subject.marsdenFields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300400 Animal Production::300403 Animal nutritionen
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Agricultural Sciencesen
dc.subject.anzsrc07 Agricultural and Veterinary Sciencesen
dc.relation.isPartOfJournal of Agricultural Scienceen
pubs.issue1en
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.volume129en


Files in this item

Default Thumbnail

This item appears in the following Collection(s)

Show simple item record