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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

The disruption of the dipping of cattle in Zimbabwe for the control of tick vectors demonstrated the dangers of creating herds with little or no natural immunity to tick-borne diseases. It is known that immunity to the tick-borne diseases heartwater (caused by Cowdria ruminantium), African redwater ...

Author(s)
Norval, R. A. I.
Publisher
Tick Research Unit., Grahamstown, South Africa
Citation
Tick biology and control. Proceedings of an International Conference held from 27-29 January 1981, under the auspices of the Tick Research Unit, Rhodes University, Grahamstown, South Africa., 1981, pp 87-90
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

Arguments against intensive dipping in Southern Africa are developed, firstly, in the light of the history of tick and tick-borne disease control in Zimbabwe and South Africa and, secondly, through consideration of the economics of intensive dipping as opposed to minimum dipping and the maintenance ...

Author(s)
Norval, R. A. I.
Citation
Zimbabwe Veterinary Journal, 1983, 14, 1/4, pp 19-25
Abstract

The transfer of larvae and adult males of Boophilus microplus (Can.) from 2 infested to 2 uninfested cattle was demonstrated under field conditions in a 0.7-ha paddock in Zimbabwe. The role of host-to-host transfers in the transmission and epidemiology of anaplasmosis and babesiosis is discussed.

Author(s)
Mason, C. A.; Norval, R. A. I.
Citation
Veterinary Parasitology, 1981, 8, 2, pp 185-188
Abstract

Serum samples were collected in 1981 and 1982 from calves less than 12 months old at 244 localities in Zimbabwe and tested by IFAT for antibodies to T. parva. Positive cases were detected at 77% of localities in communal farming areas and at 70% of localities on commercial farms, but their...

Author(s)
Norval, R. A. I.; Fivaz, B. H.; Lawrence, J. A.; Brown, A. F.
Citation
Tropical Animal Health and Production, 1985, 17, 1, pp 19-28
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

During 1982-83 a survey of diseases of domestic animals was carried out in three Communal Lands in Manicaland. Antibodies to Babesia bigemina and B. bovis were detected in a large proportion of the cattle sampled. No cattle had antibodies to the Theileria parva group of diseases, although Theileria ...

Author(s)
Bryant, B. A.; Norval, R. A. I.
Citation
Zimbabwe Veterinary Journal, 1985, 16, No. 1/2, pp 9-17
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

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