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Browsing 1991 Onderstepoort Journal of Veterinary Research, Volume 58, 1991 by Subject "Veterinary medicine -- South Africa"
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Meiswinkel, R.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Culicoides (Avaritia) miombo sp. nov. is described and illustrated from both sexes collected in northern Malawi. Two references in the literature have previously referred to this new species as either C. brosseti Vattier ...
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Odendaal, M.W.; Pieterson, P.M.; De Vos, Valerius; Botha, A.D.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Forty-four isolates of Bacillus anthracis made from carcasses and soil in different localities of an endemic anthrax area in the Kruger National Park, South Africa, were tested by standard disc diffusion for their ...
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Verwoerd, Daniel Wynand
(Pretoria : Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
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Odendaal, M.W.; Pieterson, P.M.; De Vos, Valerius; Botha, A.D.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
The biochemical, morphological and virulence profiles of 44 Bacillus anthracis isolates, obtained from various localities and carcass remains of wild animals in the Kruger National Park, South Africa, were examined. The ...
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Prozesky, Leon; Fourie, Niel; Bastianello, Stella S.; Nel, P.W.; Kellerman, T. Stephanus; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
The epidemiological, clinical and clinical pathological findings in 20 cattle and 4 sheep from 15 outbreaks of poultry litter toxicity in South Africa over the past 6 years are documented. In 6 outbreaks, the litter emanated ...
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Gummow, Bruce; Botha, C.J. (Christoffel Jacobus); Basson, A.T.; Bastianello, Stella S.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Pathological findings and liver and kidney analyses confirmed that cattle had died of chronic copper poisoning on a farm in the north-eastern Transvaal. This is the first known published record of chronic copper intoxication ...
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Horak, Ivan Gerard; Braack, L.E.O.; Spickett, Arthur M.; Van Ark, H.; Verwoerd, Daniel Wynand
(Pretoria : Agricultural Research Council, Onderstepoort Veterinary Institute, 1991)
Free-living ticks were collected by means of drag-sampling in 32 of the 35 landscape zones of the Kruger National Park during a period of 1 calendar month. Of the 18 199 specimens collected, 99,53% were larvae, 0,05% nymphs ...
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Scholtz, M.M.; Spickett, Arthur M.; Lombard, P.E.; Enslin, C.B.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
The effect of tick infestation of Hereford, Bonsmara and Nguni cows on the weaning masses of their calves in a dipping versus non-dipping situation was investigated. Breed had a major effect on the level of tick infestation, ...
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Winterbach, Hanlie Evelyn Kathleen; Apps, P.J.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
An automated headspace gas-chromatographic method has been developed for the determination of acetone in the milk, blood and urine of dairy cows. Five ml samples were saturated with 2g of sodium chloride and equilibrated ...
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Bragg, R.R. (Robert Richard); Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
A detailed microbiological and parasitological survey of salmonids and indigenous fish in the upper reaches of selected river systems in Natal was undertaken. Fish were collected from the rivers by electro-fishing, from ...
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Bragg, R.R. (Robert Richard); Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
A total of 678 fish from 26 different sites along 8 river systems was examined for the presence of trout viruses. No isolations of any viruses were made from any fish collected from these systems in Natal during this study. ...
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Bragg, R.R. (Robert Richard); Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Both pathogenic and non-pathogenic bacteria were isolated from fish, both salmonid and non-salmonid, from selected river systems in Natal. Pasteurella pisicida was isolated for the first time from fish in South Africa. The ...
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Theron, J.; Prinsloo, J.F.; Schoonbee, H.J.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Prophylactic dip treatments using formalin and malachite green were applied to 4-day old larvae and 12- and 20-day old juveniles of the European common carp, Cyprinus carpio and the African sharptooth catfish, Clarias ...
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Bragg, R.R. (Robert Richard); Allwright, D.M.; Coetzee, L.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
A drop in egg production associated with loss of pigment and soft-shelled eggs was experienced on a farm in the Western Cape. Investigations revealed high levels of antibodies against adenovirus 127, the causative agent ...
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Horak, Ivan Gerard; Boomker, Jacob Diederik Frederik; Flamand, J.R.B.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Eighteen red duikers, Cephalophus natalensis, from the Charters Creek Nature Reserve and 2 from Fanies Island Nature Reserve were processed for arthropod parasite recovery. They harboured 8 species of ixodid ticks and 2 ...
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Du Plessis, D.H.; Van Wyngaardt, Wouter; Gerdes, Gertruida Hermanna; Opperman, E.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Recently a suspected outbreak of African horsesickness in the Western Cape Province resulted in the deaths of four foals and one adult horse. Spleen samples from these animals were subjected to analysis by an enzyme-linked ...
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Groeneveld, Hendrik T.; Reinecke, R.K.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Worm egg counts were compared with nematode worm burdens from data collected from >400 sheep killed in experiments on the epidemiology of nematode parasites in the Overberg, in the winter rainfall area of the southern Cape ...
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Reinecke, R.K.; Lourens, M.; Petersen, B.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Two field trials, one with suckling Merino ewe lambs and the other with yearling Dohne Merino rams, are described. In these the anthelmintic efficacy of febantel (a benzimidazole), ivermectin, levamisole and morantel are ...
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Horak, Ivan Gerard; Fourie, L.J.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
One hundred and seventeen scrub hares, Lepus saxatilis, were examined for ixodid ticks in various regions of the Cape Province. They were infested with 18 tick species and the seasonal abundances of the immature stages of ...
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Horak, Ivan Gerard; Williams, E.J.; Van Schalkwyk, P.C.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
The tick burdens of 115 Merino sheep, slaughtered over a period of 15 consecutive months on a farm in the north-eastern Orange Free State, were determined. A total of 7 ixodid and 1 argasid tick species were recovered and ...