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Abstract

The efficacy of the tail-tag decoy system for control of Amblyomma hebraeum on cattle was tested in the field in Zimbabwe in 1992 and 1993. Rhipicephalus zambeziensis, R. evertsi and Hyalomma spp. were also seen on the cattle. Cyfluthrin, flumethrin and alpha-cypermethrin were all tested in the...

Author(s)
Allan, S. A.; Norval, R. A. I.; Sonenshine, D. E.; Burridge, M. J.
Citation
Annals of the New York Academy of Sciences, 1996, 791, pp 85-93
Abstract

The findings of an FAO project on the effects of R. appendiculatus and A. hebraeum on productivity in cattle (performed at the veterinary field station in Mazowe in the highveld of Zimbabwe) are reviewed. [Some of this work has already been published in Veterinary Parasitology, 30: 149-164 (1988); ...

Author(s)
Norval, R. A. I.
Citation
Parassitologia (Roma), 1990, 32, 1, pp 153-163
Abstract

Lactating Sanga cows of the Mashona breed from Zimbabwe, receiving either a low or a high level of nutritional supplement, were exposed to 2 levels of infestation of adult R. appendiculatus in the highveld of Zimbabwe. The effect of the ticks on the milk yield was measured over an 11-week period...

Author(s)
Norval, R. A. I.; Sutherst, R. W.; Kurki, J.; Kerr, J. D.; Gibson, J. D.
Citation
Medical and Veterinary Entomology, 1997, 11, 2, pp 148-154
Abstract

Infestations of adults and nymphs of A. hebraeum were counted on Brahman (Br), Brahman × Simmental (BS), Sanga (Sa) and Hereford (He) steers exposed to infested pastures at Mbizi in southern Zimbabwe in 1986-87. Herefords were always the most heavily infested, while the Sanga tended to carry the...

Author(s)
Norval, R. A. I.; Sutherst, R. W.; Kerr, J. D.
Citation
Experimental & Applied Acarology, 1996, 20, 10, pp 599-605
Abstract

The study vertical transmission of C. ruminantium from cows to their calves was demonstrated. 12 mixed-breed calves, born to dams living in a heartwater-endemic area of Zimbabwe, were tested postnatally for the presence of C. ruminantium. Vertical transmission was demonstrated to occur under...

Author(s)
Deem, S. L.; Norval, R. A. I.; Donachie, P. L.; Mahan, S. M.
Citation
Veterinary Parasitology, 1996, 61, 1/2, pp 119-132
Abstract

The tick A. hebraeum differs from many ixodid species in that it is not susceptible to the direct effects of the host immune response. All stages of the life cycle are able to feed repeatedly on laboratory hosts and show no progressive declines in engorged weight. However, on cattle there are...

Author(s)
Norval, R. A. I.
Citation
Insect Science and its Application, 1992, 13, 4, pp 489-494
Abstract

Amblyomma hebraeum is the principal vector to southern African ruminants of heartwater (Cowdria ruminantium infection). The role of feeding male ticks, which emit an aggregation-attachment pheromone, in attracting unfed ticks to cattle was investigated. Calves infested with feeding male ticks were...

Author(s)
Norval, R. A. I.; Andrew, H. R.; Yunker, C. E.
Citation
Science (Washington), 1989, 243, 4889, pp 364-365
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

The effects of larvae, nymphs and adults of R. appendiculatus on the growth of Bos indicus × B. taurus (Sanga) steers and on B. taurus (Friesian × Hereford) steers and heifers was measured by exposing groups, maintained in the same pastures in Zimbabwe, to different levels of tick challenge. Larvae ...

Author(s)
Norval, R. A. I.; Sutherst, R. W.; Kurki, J.; Gibson, J. D.; Kerr, J. D.
Citation
Veterinary Parasitology, 1988, 30, 2, pp 149-164

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