Browsing 1994 Onderstepoort Journal of Veterinary Research, Volume 61, 1994 by Title

Browsing 1994 Onderstepoort Journal of Veterinary Research, Volume 61, 1994 by Title

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  • Parasites of South African freshwater fish. VI. Nematode parasites of some fish species in the Kruger National Park 
    Boomker, Jacob Diederik Frederik; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The nematode parasites of 30 spot-tailed robbers, Brycinus imberi, five tiger-fish, Hydrocynus vittatus, 77 large-scaled yellowfish, Barbus marequensis, two mudsuckers, Labeo molybdinus, 114 catfish, Clarias gariepinus, ...
  • Parasites of South African freshwater fish. VII. Nematodes of some scaled fishes from the Hartbeespoort Dam, Transvaal 
    Boomker, Jacob Diederik Frederik; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The nematode parasites of 16 large-scaled yellowfish, Barbus marequensis , six silverfish, Barbus mattozi, six small-scaled yellowfish , Barbus polylepis, 52 canary kurper, Chetia flaviventris , 11 carp, Cyprinus carpio ...
  • Perinatal mortality in lambs of ewes exposed to cultures of Diplodia maydis (= Stenocarpella maydis) during gestation. A study of the central-nervous-system lesions 
    Prozesky, Leon; Kellerman, T. Stephanus; Maartens, B.P.; Schultz, R.A. (Rowena Anitra); Swart, D. Petro; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Previously published results of dosing trials, involving 82 ewes, revealed that 66% of the offspring of dams exposed to cultures of Diplodia maydis in the second trimester of pregnancy and 87% of lambs of ewes exposed ...
  • Photosensitivity in South Africa. VII. Chemical composition of biliary crystals from a sheep with experimentally induced geeldikkop 
    Coetzer, Jacobus A.W.; Miles, Christopher O.; Wilkins, A.L.; Erasmus, G.L.; Kellerman, T. Stephanus; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Geeldikkop was induced in a sheep by oral administration of crude saponins from Tribulus terrestris. Centrifugation of the bile from this sheep gave a pale green sediment of crystalloid material which was insoluble in ...
  • Photosensitivity in South Africa. VIII. Ovine metabolism of Tribulus terrestris saponins during experimentally induced geeldikkop 
    Miles, Christopher O.; Wilkins, A.L.; Erasmus, G.L.; Kellerman, T. Stephanus; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Geeldikkop was induced in a sheep by dosing it orally with a crude extract of the steroidal saponins from Tribulus terrestris. GC-MS analysis of the sheep's ruminal contents, bile, faeces and urine for free and conjugated ...
  • Pseudorabies and transmissible gastroenteritis : a serological survey in South Africa 
    Williams, R.; Esterhuysen, J.J.; Robinson, J.T.R.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Two specific and sensitive, indirect enzyme-linked immunosorbent assays (ELISAs) utilizing a protein G-peroxidase conjugate were developed to detect antibodies to the pseudorabies virus (PRV) and the transmissible ...
  • Putative avocado toxicity in two dogs 
    Buoro, I.B.J.; Nyamwange, S.B.; Chai, D.; Munyua, S.M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Two dogs were seen at the University Veterinary Teaching Hospital, Nairobi, Kenya, both having histories of dyspnoea, progressively enlarging abdomens, anasarca, ascites, pleural and pericardial effusion, and pulmonary ...
  • A rapid method of estimating the abundance of immature blackflies (Diptera: Simuliidae) 
    Palmer, R.W.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    A ten-point visual method of estimating the abundance of immature blackflies in the field is proposed and tested. The method is based on the comparison of larvae and pupae found on natural substrates, with ten ...
  • A rapid method to quantify bacterial contamination on hatching eggs. 1. Correlation of optical density with initial bacterial count 
    Pienaar, A.C.E.; Coetzee, L.; Bragg, R.R. (Robert Richard); Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The use of optical-density (OD) readings after a 6-h incubation period, as a suitable method to quantify the bacterial contamination on hatching eggs, was established by the use of pure cultures of five bacterial isolates ...
  • Sequential feeding of Ixodes rubicundus on its natural host, Elephantulus myurus : effects on tick mass and on engorgement and moulting success 
    Horak, Ivan Gerard; Du Toit, J.S.; Fourie, L.J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Engorgement, mass at repletion and moulting success of immature Ixodes rubicundus after sequential infestations of their natural hosts, rock elephant shrews (Elephantulus myurus) , were investigated under laboratory ...
  • Serum- and bone-mineral status of ostriches with tibiotarsal rotation 
    Soley, John Thomson; Bezuidenhout, A.J. (Abraham Johannes), 1942-; Burger, W.P.; Reyers, Fred; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Tibiotarsal rotation in ostrich chicks is a serious problem that accounts for considerable financial loss to ostrich farmers. Serum- and bone-mineral analyses of 20 ostrich chicks with tibiotarsal rotation were compared ...
  • Sleeping sickness and the central nervous system 
    Pentreath, V.W.; Baugh, P.J.; Lavin, D.R.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Chronic African trypanosomiasis is associated with progressive behavioural deficits, for which there is a complex underlying central nervous system (CNS) pathology. This has been extensively studied in man and a range ...
  • Studies on the presence of endotoxin activity and inflammatory products (Leukotrienes) in cases of experimentally induced heartwater in sheep 
    Van Amstel, S.R.; Myburgh, Elsbe; Mundell, Jennifer; Davidson, B.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The presence of endotoxin was examined in seven sheep with experimentally induced heartwater. Elevations in endotoxin levels were recorded in one sampling in three of the seven sheep during the acute stage of the disease. ...
  • Subject index 
    Anonymous; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
  • A survey of the incidence and importance of the tick-borne diseases heartwater, redwater and anaplasmosis in the heartwater-endemic regions of South Africa 
    Stoltsz, Wilhelm Heinrich; Du Plessis, J.L.; De Waal, D.T.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    In an almost 50% response to a survey questionnaire, farmers in the heartwater-endemic regions of South Africa indicated that they were experiencing losses of 1,3, 0,3 and 0,2% in cattle due to heartwater, redwater and ...
  • The Theiler Memorial Trust Award 
    Verwoerd, Daniel Wynand; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
  • Trypanosomes of some sub-Saharan birds 
    Squires-Parsons, Deborah; Bennett, Gordon F.; Earle, Roy A.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Linear measurements and derived indices from striated trypanosomes in nine species of sub-Saharan birds representing seven families of the Passeriformes, were compared. The dimensions of the striated trypomastigotes from ...
  • Ultrastructure of ostrich (Struthio camelus) spermatozoa. II. Scanning electron microscopy 
    Soley, John Thomson; Roberts, D.C.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The three-dimensional structure and size of ostrich sperm is unknown. In this study, the morphology and dimensions of ostrich sperm were determined by scanning electron microscopy of semen samples obtained from sexually ...
  • Understanding tsetse flies 
    Langley, P.A.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The discovery that tsetse flies are the vectors of African trypanosomosis, causing sleeping sickness in man and nagana in cattle, occurred at the start of a rapidly expanding colonialism in sub-Saharan Africa. Hence, the ...
  • Vanadium air pollution : a cause of malabsorption and immunosuppression in cattle 
    Gummow, Bruce; Bastianello, Stella S.; Botha, C.J. (Christoffel Jacobus); Smith, H.J.C.; Basson, A.J.; Wells, B.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    An epidemiological investigation into an "illthrift" problem occurring on a dairy farm adjacent to an alloy-processing unit, established that the probable cause of the problem was chronic vanadium poisoning. The disease ...