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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  • 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 ...
  • The virtual absence of Culicoides imicola (Diptera: Ceratopogonidae) in a light-trap survey of the colder, high-lying area of the eastern Orange Free State, South Africa, and implications for the transmission of arboviruses 
    Venter, Gert Johannes; Meiswinkel, R.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Altogether 52 078 Culicoides biting midges of 35 species were collected during February 1990 and 1993 in 40 light-trap collections made on 17 cattle and/or sheep farms in the Bethlehem and Fouriesburg districts of the ...