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Browsing by UP Author "Van Wyk, Jan Aucamp"
Now showing items 1-20 of 39
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Van Wyk, Jan Aucamp; Stenson, M.O.; Van der Merwe, J.S.; Vorster, R.J.; Viljoen, P.G.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)Surveys to determine the prevalence and degree of resistance of Haemonchus spp. of sheep and goats to the available anthelmintics in South Africa indicate that small ruminant production is entering a crisis situation ...
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Reynecke, Dean Peter; Van Wyk, Jan Aucamp; Gummow, Bruce; Dorny, P.; Boomker, Jacob Diederik Frederik (Elsevier B.V., 2011-05)Test sensitivity and specificity for the FAMACHA© clinical test for anaemia due to haemonchosis have previously been shown to be adequate in differentiating between heavily/less heavily infected sheep, but these properties ...
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Maia, Dhéri; Rosalinski-Moraes, Fernanda; Van Wyk, Jan Aucamp; Weber, Saulo; Sotomaior, Cristina Santos (Elsevier, 2014-02)The FAMACHA©system is a method for selective anthelmintic treatment comprising earlydetection of haemonchosis in sheep and goats. In order to evaluate the hands-on trainingmethodology and the learning level of the participants, ...
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Van Wyk, Jan Aucamp; Bigalke, R.D.; South African Veterinary Association. History Committee (2009-02-27)Biography of the zoologist and parasitologist Anna J.M. Verster. The biography includes information about her education and career, scientific contributions and writings, homages and distinctions.
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Van Wyk, Jan Aucamp; Reynecke, Dean Peter (Elsevier B.V., 2011-05)This article is the first of a series aimed at developing specific decision support software for on-farm optimisation of sustainable integrated management of haemonchosis. It contains a concept framework for such a system ...
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Van Wyk, Jan Aucamp; Malan, F.S.; Wessels, C.D.; Boomker, Jacob Diederik Frederik (Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2001)Trials were conducted on a farm in Mpumalanga Province in South Africa to test the possibility of grading the colour of the ocular mucous membranes of sheep as an indication of the extent to which the animals are affected ...
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Van Wyk, Jan Aucamp; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)The infectivity for sheep of cryopreserved infective larvae (L3) of various strains of Haemonchus contortus, Trichostrongylus colubriformis and Trichostrongylus axei is compared using previously published results of trials ...
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Van Wyk, Jan Aucamp; Gerber, H.M.; Alves, Regina M.R.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)Infective larvae of selected batched of the following nematode species from sheep and cattle were examined for survival and infectivity (by injection into either the abomasum, the duodenum, or the jugular vein) after having ...
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Van Wyk, Jan Aucamp; Van Rensburg, L.J.; Boomker, Jacob Diederik Frederik (Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2003)Over a period of about 12 years, 30 abnormal Schistosoma mattheei cercariae were found among a total of approximately 2.8 million examined. Initially seven were recovered from about 1.02 million (0.0007 %), which were ...
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Leask, Rhoda; Van Wyk, Jan Aucamp; Thompson, P.N. (Peter N.); Bath, Gareth F. (Elsevier, 2013-02)Much research has gone into developing a sustainable management tool for haemonchosis, namely the FAMACHA© system, which has been validated by numerous studies worldwide. However, the financial implications on production ...
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Riley, D.G.; Van Wyk, Jan Aucamp (Elsevier, 2011-04)Internal parasite infestation in sheep can be practically assessed using a subjective score for the color of the inner eyelid (FAMACHA© score). Additive genetic variation for this trait would permit selection against ...
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Van Wyk, Jan Aucamp; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1985)The research activities of the Veterinary Research Institute, Onderstepoort, from its inception in 1908 until recent times are reviewed in this first article of a series on nematode epidemiology of sheep and cattle. While ...
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Groeneveld, Hendrik T.; Van Wyk, Jan Aucamp; Carmichael, I.H.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)Parafilariosis was first described in South Africa in 1964, thereafter being discovered at numerous localities in the country. When it became obvious that Parafilaria bovicola, for which no treatment was known, caused ...
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Van Wyk, Jan Aucamp; Alves, Regina M.R.; Van Rensburg, L.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1988)The faeces of 11 horses were examined for Fasciola spp. eggs. One of them was positive for Fasciola hepatica, a finding which was confirmed post-mortem. The 10 negative horses were subsequently infested with either F. ...
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Van Wyk, Jan Aucamp; Bath, Gareth F.; Gerber, H.M.; Alves, Regina M.R.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)A strain of Trichostrongylus colubriformis from Nottingham Road, in Natal, was found to be solidly resistant to levamisole and morantel at the recommended dose levels. Untreated control sheep in fact harboured fewer worms ...
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Van Wyk, Jan Aucamp; Van Wyk, Laetitia; Boomker, Jacob Diederik Frederik (Published jointly by the Agricultural Research Council, ARC-Onderstepoort Veterinary Institute and the Faculty of Veterinary Science, University of Pretoria., 2002)Faecal pellets from a sheep that was artificially infected with a monoculture of Haemonchus contortus were collected over a 2-h period in the morning. In the laboratory the faeces were thoroughly mixed by hand and 48 by 1 ...
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Riley, D.G.; Van Wyk, Jan Aucamp (Elsevier, 2009)The objectives of this study were to estimate genetic parameters for FAMACHA score and related traits at different levels of worm challenge in sheep and to assess the effect of different methods for modelling records from ...
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Airs, Paul M.; Ventura-Cordero, Javier; Gwiriri, Lovemore C.; Tinsley, Jonathan H.I.; Mvula, Winchester; Lee, Michael R.F.; Van Wyk, Jan Aucamp; Nalivata, Patson C.; Takahashi, Taro; Morgan, Eric R.; Safalaoh, Andrews C.L. (Elsevier, 2023-12)The true value of goats, their management systems, and the limitations of smallholdings have not been fully explored in the context of sustainable livelihoods among rural smallholders in central Malawi. However, goats are ...
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Van Wyk, Jan Aucamp; Gerber, H.M.; Alves, Regina M.R.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1984)Cryopreservation of the infective larvae (L₃) of nematodes is being used increasingly for the routine maintenance of pure strains of nematodes in the laboratory. Gelatin capsules are frequently used to administer the L₃ ...
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Jex, Aaron R.; Waeschenbach, Andrea; Hu, Min; Van Wyk, Jan Aucamp; Beveridge, Ian; Littlewood, D. Timothy J.; Gasser, Robin B. (BioMed Central, 2009-02)BACKGROUND: Hookworms are blood-feeding nematodes that parasitize the small intestines of many mammals, including humans and cattle. These nematodes are of major socioeconomic importance and cause disease, mainly as a ...
Now showing items 1-20 of 39