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dc.contributor.author | Spickett, Arthur M.![]() |
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dc.contributor.author | Van Ark, H.![]() |
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dc.contributor.editor | Verwoerd, Daniel Wynand | |
dc.date.accessioned | 2014-09-01T11:13:03Z | |
dc.date.available | 2014-09-01T11:13:03Z | |
dc.date.created | 2013 | |
dc.date.issued | 1990 | |
dc.description | The 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.abstract | Samples of 6, 1st generation larval populations of Boophilus decoloratus, originating from field collected females, were subjected to increasing doses of the organophosphate acaricide, Dioxathion. The dose-response relationship for 3 populations showed random heterogeneity, where systematic deviations from the linear probit lines were observed for the other 3 populations. Logistic and Gompertz regressions were also fitted for all 6 populations. Probit regressions fitted best for 2 populations exhibiting heterogeneous responses. The logistic regression fitted best for 1 population with heterogeneous responses and 1 population with systematic deviating responses. The Gompertz regression fitted best for the 2 remaining populations exhibiting systematic deviating responses. The Gompertz function may be useful in describing the dose-response relationship obtained for certain acaricidal toxicity tests. | en |
dc.description.librarian | mn2014 | |
dc.identifier.citation | Spickett, AM & Van Ark, H 1990, 'Fitting the Gompertz function to dose-response data of larval tick populations’, Onderstepoort Journal of Veterinary Research, vol. 57, no. 2, pp. 115-118. | en |
dc.identifier.issn | 0330-2465 | |
dc.identifier.uri | http://hdl.handle.net/2263/41877 | |
dc.language.iso | en | en |
dc.publisher | Published by the Government Printer, Pretoria. | en |
dc.rights | ©South Africa. Dept. of Agricultural Technical Services. ©University of Pretoria. Dept. of Library Services (digital). | en |
dc.subject | Veterinary medicine | en |
dc.subject.lcsh | Veterinary medicine -- South Africa | |
dc.title | Fitting the Gompertz function to dose-response data of larval tick populations | en |
dc.type | Article | en |