dc.contributor.author |
Kok, D.J.
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dc.contributor.author |
Fourie, L.J.
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dc.contributor.author |
Oberem, P.T.
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dc.contributor.editor |
Verwoerd, Daniel Wynand |
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dc.date.accessioned |
2013-12-09T07:48:15Z |
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dc.date.available |
2013-12-09T07:48:15Z |
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dc.date.created |
2013 |
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dc.date.issued |
1994 |
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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 |
A suspended-net technique was used to capture blackflies attracted to and engorging on Dorper and Merino sheep on irrigated pastures. Two bait animals of each breed were restrained individually in wire-mesh enclosures located within four larger pens, each containing nine more animals of the same breed. Nets were suspended partly over the restrained animals and blackflies were collected at the end of 2-hour or longer periods. Mean numbers of blackflies captured in association with Merino (73,3/h) and Dorper sheep (89, 1 /h) did not differ significantly. Numbers of captured blackflies correlated (rho = 0,8361) with levels of irritation shown by sheep. Engorgement on Merinos was significantly (p = 0,009) higher than on Dorpers. Percentage engorgement was low, mostly below 10% on Merinos and below 5% on Dorpers. When high wind speeds and high saturation deficits (associated with temperatures in the mid-thirties) occurred, the success of capture was impaired. The technique is useful for quantifying the abundance of irritating blackflies in the immediate proximity of smallstock under experimental conditions. |
en |
dc.description.librarian |
mn2013 |
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dc.description.sponsorship |
Hoechst Ag-Vet (Pty) Ltd. |
en |
dc.identifier.citation |
Kok, DJ, Fourie, LJ & Oberem, PT 1994, 'A method for the assessment of blackfly (Diptera: Simuliidae) attraction to and engorgement on sheep in South Africa’, Onderstepoort Journal of Veterinary Research, vol. 61, no. 1, pp. 7-11. |
en |
dc.identifier.issn |
0330-2465 |
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dc.identifier.uri |
http://hdl.handle.net/2263/32731 |
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dc.language.iso |
en |
en |
dc.publisher |
Published by the Agricultural Research Council, Onderstepoort Veterinary Institute |
en |
dc.rights |
© ARC-Onderstepoort (original).
© University of Pretoria. Dept of Library Services (digital). |
en |
dc.subject |
Veterinary medicine |
en |
dc.subject |
Hopetown |
en |
dc.subject |
Orange River |
en |
dc.subject.lcsh |
Veterinary medicine -- South Africa |
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dc.subject.lcsh |
Simuliidae |
en |
dc.title |
A method for the assessment of blackfly (Diptera: Simuliidae) attraction to and engorgement on sheep in South Africa |
en |
dc.type |
Article |
en |