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Abstract

The occurrence of endemic stability for heartwater is a controversial issue, because the means by which young cattle and other neonatal ruminants become infected and acquire immunity to the disease have never been adequately explained. A study was conducted in a heartwater-endemic area in...

Author(s)
Norval, R. A. I.; Donachie, P. L.; Meltzer, M. I.; Deem, S. L.; Mahan, S. M.
Citation
Veterinary Parasitology, 1995, 58, 4, pp 335-352
Abstract

29 Mashona cows were allocated to 2 balanced groups and kept in separate paddocks at a stocking rate of 1 animal per 8 ha. One group received regular acaricide treatment to control bont (Amblyomma hebraeum) and other ticks with flumethrin pour-on preparation (Drastic Deadline) every 2 weeks. The...

Author(s)
Meltzer, M. I.; Norval, R. A. I.; Donachie, P. L.
Citation
Tropical Animal Health and Production, 1995, 27, 3, pp 129-144
Abstract

T. p. bovis isolates were tested for their immunizing capacity under natural field challenge on Willsbridge Farm in the highveld of Zimbabwe. 15 susceptible Sussex yearlings (about 14 months old) were immunized with the Boleni stock and 15 with a mixture of 3 isolates from the farm, using...

Author(s)
Koch, H. T.; Kambeva, L.; Ocama, J. G. R.; Munatswa, F. C.; Franssen, F. F. J.; Uilenberg, G.; Dolan, T. T.; Norval, R. A. I.
Citation
Veterinary Parasitology, 1990, 37, 3-4, pp 185-196
Abstract

This paper is the first in a series reporting the findings of a national tick survey in Zimbabwe in 1975-80. The genus Boophilus is represented there by B. decoloratus (Koch) (which is indigenous and occurs throughout most of the country) and B. microplus (Can.) (which is a recent introduction from ...

Author(s)
Mason, C. A.; Norval, R. A. I.
Citation
Zimbabwe Veterinary Journal, 1980, 11, 3/4, pp 36-43
Abstract

This article (originally published in Rhodesian Veterinary Journal, 10 (1979)) discusses the history of tick-borne and tick-associated diseases in cattle (Chrysomya bezziana myiasis (frequently associated with the bites of Hyalomma spp.), rhipicephaline tick toxicosis, sweating sickness (caused by ...

Author(s)
Lawrence, J. A.; Norval, R. A. I.
Citation
Historia Medicinae Veterinariae, 1987, 12, 4, pp 89-101
Abstract

Bovine theileriosis, caused by Theileria lawrencei and transmitted by Rhipicephalus appendiculatus Neum. has a limited incidence in Rhodesia, control being achieved by intensive dipping or spraying of cattle to kill the tick vector. Alternative methods of control have been considered, namely the...

Author(s)
Lawrence, J. A.; Norval, R. A. I.
Citation
Rhodesia Agricultural Journal, 1978, 75, 6, pp 173-176
Abstract

The problems caused by ticks in 4 kinds of areas in Rhodesia (tribal trust lands, African purchase areas, European farming areas and wildlife areas) are compared. The most abundant tick species in each kind of area are listed, and the tick-borne diseases associated with them are discussed. The...

Author(s)
Norval, R. A. I.
Citation
Rhodesian Veterinary Journal, 1977, 8, 2, pp 33-38

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