Demarcation of potentially mineral-deficient areas in Central and Northern Namibia by means of natural classification systems

dc.contributor.authorGrant, C.C. (Catharina Cornelia)
dc.contributor.authorBiggs, H.C.
dc.contributor.authorMeissner, H.H.
dc.contributor.editorVerwoerd, Daniel Wynand
dc.date.accessioned2013-08-15T11:14:13Z
dc.date.available2013-08-15T11:14:13Z
dc.date.created2013
dc.date.issued1996
dc.descriptionThe articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat X Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.en
dc.description.abstractMineral deficiencies that lead to production losses often occur concurrently with climatic and management changes. To diagnose these deficiencies in time to prevent production losses, long-term monitoring of mineral status is advisable. Different classification systems were examined to determine whether areas of possible mineral deficiencies could be identified, so that those which were promising could then be selected for further monitoring purposes. The classification systems addressed differences in soil, vegetation and geology, and were used to define the cattle-ranching areas in the central and northern districts of Namibia. Copper (Cu), iron (Fe), zinc (Zn), manganese (Mn) and cobalt (Co) concentrations were determined in cattle livers collected at abattoirs. Pooled faecal grab samples and milk samples were collected by farmers, and used to determine phosphorus (P) and calcium (Ca), and iodine (I) status, respectively. Areas of low P concentrations could be identified by all classification systems. The lowest P concentrations were recorded in samples from the Kalahari-sand area, whereas faecal samples collected from cattle on farms in the more arid areas, where the harder soils are mostly found, rarely showed low P concentrations. In the north of the country, low iodine levels were found in milk samples collected from cows grazing on farms in the northern Kalahari broad-leaved woodland. Areas supporting animals with marginal Cu status, could be effectively identified by the detailed soil-classification system of irrigation potential. Copper concentrations were lowest in areas of arid soils, but no indication of Co, Fe, Zn, or Mn deficiencies were found . For most minerals, the geological classification was the best single indicator of areas of lower concentrations. Significant monthly variation for all minerals could also be detected within the classification system . It is concluded that specific classification systems can be useful as indicators of areas with lower mineral concentrations or possible deficiencies.en
dc.description.librarianmn2013
dc.identifier.citationGrant, CC, Biggs, HC & Meissner, HH 1996, 'Demarcation of potentially mineral-deficient areas in central and northern Namibia by means of natural classification systems’. Onderstepoort Journal of Veterinary Research, vol. 63, no. 2, pp. 109-120.en
dc.identifier.issn0330-2465
dc.identifier.urihttp://hdl.handle.net/2263/22039
dc.language.isoenen
dc.publisherPublished by the Agricultural Research Council, Onderstepoort Veterinary Instituteen
dc.rights© ARC-Onderstepoort (original). © University of Pretoria. Dept of Library Services (digital).en
dc.subjectVeterinary medicineen
dc.subjectClassifiction systemsen
dc.subjectMineral-deficient areasen
dc.subjectNamibiaen
dc.subjectNaturalen
dc.subject.lcshVeterinary medicine -- South Africa
dc.subject.lcshMineralogy, Determinativeen
dc.subject.lcshMinerals -- Namibiaen
dc.subject.lcshPhysical geology -- Namibiaen
dc.titleDemarcation of potentially mineral-deficient areas in Central and Northern Namibia by means of natural classification systemsen
dc.typeArticleen

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