- UPSpace Home
- →
- South African National Veterinary Repository
- →
- Browsing South African National Veterinary Repository by UP Author
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing South African National Veterinary Repository by UP Author "Van Wyk, Jan Aucamp"
Now showing items 1-20 of 20
-
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 ...
-
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.
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
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 ...
-
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. ...
-
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 ...
-
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 ...
-
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 ...
-
Van Wyk, Jan Aucamp; Gerber, H.M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute ., 2000)Infective larvae (L3) of two different batches of anthelmintic-susceptible Haemonchus contortus, cryopreserved for 15,6 and 15,7 years in liquid nitrogen appeared dead when examined 10-20 min after thawing. However, having ...
-
Van Wyk, Jan Aucamp; Malan, F.S.; Gerber, H.M.; Alves, Regina M.R.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)During the past decade in South Africa there has been a continual increase in sheep of strains of gastrointestinal helminths resistant to the modern anthelmintics. Five strains of Haemonchus contortus are described in this ...
-
Van Wyk, Jan Aucamp; Titoy, G.A.P.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)The infective larvae of Haemonchus contortus (L3) obtained from an artificially infected sheep injected with 125 µCi of ⁵⁹Fe, incorporated the isotope and retained it in sufficient quantities to be detectable by autoradiography ...
-
Van Wyk, Jan Aucamp; 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)Anthelmintic resistance involving particularly the gastrointestinal nematodes of small ruminants is escalating globally, to the extent that in certain countries, such as South Africa, it has already reached alarming ...
-
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)A large Schistosoma mattheei ovum containing two miracidia was recovered from a squash preparation of the liver of an experimentally infected hamster. When observed, the miracidia were motile and facing in opposite directions.
-
Van Wyk, Jan Aucamp; Van Rensburg, L.J.; Heitmann, L.P.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1997)Three groups of young oxen were infected percutaneously with cercariae of Schistosoma mattheei. Three of five oxen infected with 248 cercariae/kg mass died or were killed in extremis 58-70 d after infection, a fourth ...
-
Van Wyk, Jan Aucamp; Van Schalkwyk, Louwrens; Van Schalkwyk, P.C.; Visser, Evelyn L.; Alves, Regina M.R.; Gerber, H.M.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)A strain of Haemonchus contortus from the Pietermaritzburg district of Natal was found to be resistant to levamisole (geometric mean efficacy 76,5 %), morantel (41,9 %), the benzimidazoles (oxfendazole: 33,7 %) and rafoxanide ...
-
Van Wyk, Jan Aucamp; Malan, F.S.; Gerber, H.M.; Alves, Regina M.R.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)Two field strains of Haemonchus contortus, one from Pretoria on the Highveld and the other from White River in the Lowveld of the Transvaal, showed pronounced resistance to rafoxanide at a dosage rate of 7,5 mg/kg live ...
Now showing items 1-20 of 20