Microclimatic effect on vertical migration of Haemonchus contortus and Haemonchus placei third-stage larvae on irrigated Kikuyu pasture

dc.contributor.authorKrecek, R.C.
dc.contributor.authorHartman, R.
dc.contributor.authorThorne, A.
dc.contributor.editorVerwoerd, Daniel Wynand
dc.contributor.upauthorGroeneveld, Hendrik T.
dc.date.accessioned2013-09-12T08:50:40Z
dc.date.available2013-09-12T08:50:40Z
dc.date.created2013
dc.date.issued1995
dc.descriptionThe articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.en
dc.description.abstractThe influence of microclimate on numbers of third-stage larvae of Haemonchus contortus and Haemonchus placei in four strata of irrigated Kikuyu pasture was assessed. On 36 different, interspersed days three replicates of pasture samples were collected on three occasions per day from 1990-1992 for larval recovery and the log₁₀ mean counts of the larvae recovered were analysed by use of ANOVA models. Because the ground-surface area from which herbage was collected was standardized, estimated larval counts for the different strata could be compared; this was not possible in our previous studies. For H. contortus, the estimated larval counts in the four strata were predicted by microclimatic air temperature, relative humidity and soil moisture, with the coefficient-of-determination (R²) values ranging from 0,15-0,35. Of these, air temperature had the greatest effect. The same three predictors, together with illumination and wind speed, featured for H. placei, with R² values of 0,19-0,52. With the exception of wind speed and illumination, which (for H. placei) had the opposite effect, all the microclimatic parameters listed, predicted an increase in numbers of larvae from a lower to an upper strata.en
dc.description.librarianmn2013
dc.description.sponsorshipUniversity of Pretoria. Foundation for Research Development. Meat Board of South Africa. Department of Agriculture.en
dc.identifier.citationKrecek, RC, Hartman, R, Groeneveld, HT & Thorne, A 1995, 'Microclimatic effect on vertical migration of Haemonchus contortus and Haemonchus placei third-stage larvae on irrigated Kikuyu pasture’. Onderstepoort Journal of Veterinary Research, vol. 62, no. 2, pp. 117-122.en
dc.identifier.issn0330-2465
dc.identifier.urihttp://hdl.handle.net/2263/31702
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.subjectMicroclimatic effecten
dc.subjectVertical migrationen
dc.subjectHaemonchus contortusen
dc.subjectHaemonchus placeien
dc.subjectIrrigated Kikuyu pastureen
dc.subjectClimatic modelsen
dc.subjectThird-stage larvaeen
dc.subject.lcshVeterinary medicine -- South Africa
dc.titleMicroclimatic effect on vertical migration of Haemonchus contortus and Haemonchus placei third-stage larvae on irrigated Kikuyu pastureen
dc.typeArticleen

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