Browsing Onderstepoort Journal of Veterinary Research by Title

Browsing Onderstepoort Journal of Veterinary Research by Title

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  • Vaccination to control an outbreak of Mycoplasma crocodyli infection 
    Mohan, K.; Foggin, Chris M.; Dziva, Francis; Muvavarirwa, P.; 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)
    Details of a severe outbreak of M. crocodyli infection in farmed crocodiles are reported. The outbreak was suspected to have been precipitated by translocation-related stress on the animals brought from a farm ...
  • Validation of an indirect enzyme-linked immunosorbent assay for the detection of antibody against Brucella abortus in cattle sera using an automated ELISA workstation 
    Paweska, Janusz Tadeusz; Prozesky, Leon; Potts, A.D.; Harris, H.J.; Smith, S.J.; Viljoen, Gerrit Johannes; Dungu, B.; Brett, O.L.; Bubb, M.; 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)
    An automated indirect enzyme-linked immunosorbent assay (I-ELISA) for the serological diagnosis of bovine brucellosis was developed and validated in-house. A total of 4803 cattle sera from South Africa ( n=3 643), Canada ...
  • Validity of intradermal tuberculin testing for the screening of bovine tuberculosis in Madagascar 
    Quirin, R.; Rasolofo, V.; Andriambololona, R.; Ramboasolo, A.; Rasolonavalona, T.; Raharisolo, C.; Rakotoaritahina, H.; Chanteau, S.; Boisier, P.; 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)
    A sample survey with the objective of determining the prevalence of bovine tuberculosis by means of an intradermal tuberculin test was conducted in Madagascar and it was found that the prevalence rate varied ...
  • The value of the microtitre serum agglutination test as a second screening test in bovine brucellosis 
    Herr, S.; Te Brugge, Lesley A.; Guiney, M.C.M.; Steyn, P.J.J.; Bigalke, R.D.; Cameron, Colin McKenzie; Gilchrist, Frances M.C.; Jordaan, E.; Morren, A.J.; Verster, Anna J.M.; Verwoerd, Daniel Wynand; Walker, Jane B. (Published by The Government Printer, Pretoria, 1982)
    The use of the serum agglutination test (SAT) as a 2nd screening test led to a reduction in false negative screening reactions especially in sera delayed in transit and provided an easy check on human error in 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 ...
  • Variation in Bacillus anthracis 
    Sterne, Max; Du Toit, P.J. (Pretoria : The Government Printer, 1937)
    l. Smooth mucoid colonies developed in anthrax cultures held for long periods at 37°C. in a number of different media. Similar colonies developed in strains attenuated at 42°C. 2. All these smooth mucoid colonies yielded ...
  • Variation in clinical disease and species susceptibility to psittacine beak and feather disease in Zimbabwean lovebirds 
    Kock, N.D.; Hangartner, P.U.; Lucke, V.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1993)
    While psittacine beak and feather disease has caused 100% mortality in captive flocks of 2 species of native Zimbabwean lovebirds (Agapornis nigrigensis and A. lilianae), other lovebird species in close contact with the ...
  • Variation in morphology of ephemeral fever virus 
    Theodoridis, A.; Lecatsas, G.; De Kock, V.E.; De Lange, M.; Bigalke, R.D.; Cameron, Colin McKenzie; Walker, Jane B.; Verster, Anna J.M. (Published by the Government Printer, Pretoria, 1973)
    Electron microscope studies on the three ephemeral fever virus (EFV) strains EFVl, EFV13 (South Africa) and Japanese bovine epizootic fever (BEF) virus (Strain YHK) showed that the normally cone-shaped South African EFV, ...
  • Variation in the colony form of the anthrax bacillus 
    Sterne, Max; Du Toit, P.J. (Pretoria : Government Printer, 1938)
    The number of variant forms which can develop in cultures of the anthrax bacillus seems to be very large. (Gratia 1924; Nungester 1929; Stamatin 1934, 1935a, 1935b; Januschke 1935.) Some changes in colony form are so abrupt ...
  • Vasectomy as method of sterilizing ram lambs : a comparison with castration 
    Quinlan, John; Union of South Africa. Dept. of Agriculture (Pretoria : Government Printer and Stationery Office, 1928)
  • The vegetable diet theory of Glossina pallidipes 
    Harris, R.H.T.P.; Whitnall, A.B.M.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J. (Union of South Africa : Dept. of Agriculture, 1934)
    In view of the statement recently made by A. Davidson that Glossina pallidipes Aust., can feed on the latex of Euphorbia tirucalli and Sarcostemnus viminale the authors discuss the digestive anatomy of the fly and describe ...
  • The venous drainage of the cervical vertebrae of the ox (Bos taurus L.) 
    Smuts, M.M.S. (Malie Marie Sophie), 1933-; De Kock, V.E.; Bigalke, R.D.; Cameron, Colin McKenzie; Gilchrist, Frances M.C.; Morren, A.J.; Verster, Anna J.M.; Verwoerd, Daniel Wynand; Walker, Jane B. (The Government Printer, Pretoria, 1977)
    The venous drainage of the cervical vertebrae of the ox was studied in 16 animals (Friesland, Jersey and Guernsey cross-breeds), ranging from near full-term foetuses to adults. The extra- and intraosseous veins of the ...
  • Ventriculo-atrial conduction in the ovine heart, caused by premature ventricular complexes 
    Ker, James A.; Webb, E.C. (Edward Cottington); 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)
    In humans, and certain animals, the atrioventricular conduction system is capable of bidirectional conduction. Depolarization impulses, originating in the ventricle itself, may thus be conducted in a retrograde direction ...
  • Veterinary biochemical studies I. A rapid method for the determination of copper in biological material 
    Le Roux van Niekerk, P.; Du Toit, P.J. (Published by the Government Printer, Pretoria, 1937)
    Of the micro-methods which have been proposed for the determination of copper, the method of Biazzo (1926) as modified by Elvehjem and Lindow (1929) has been found to be the most practicable. Until recently McFarlane, ...
  • 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 ...
  • Virulence and heterologous strain immunity of South African and Australian Babesia bovis strains with reduced pathogenicity 
    De Vos, A.J.; Bessenger, R.; Fourie, C.G.; Steyn, P.J.J.; Bigalke, R.D.; Cameron, Colin McKenzie; Gilchrist, Frances M.C.; Jordaan, E.; Morren, A.J.; Verster, Anna J.M.; Verwoerd, Daniel Wynand; Walker, Jane B. (Published by The Government Printer, Pretoria, 1982)
    A South African Babesia bovis strain showed loss of virulence after 10 rapid passages in splenectomized calves. The virulence was comparable with that of an attenuated Australian vaccine strain. Vaccination of crossbred ...
  • Virulence of South African isolates of Haemophilus paragallinarum. Part 1: NAD-dependent field isolates 
    Bragg, R.R. (Robert Richard); 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)
    The virulence of four South African field isolates of NAD-dependent Haemophilus paragallinarum, representing the four serovars known to occur in that country, was investigated. During this study an alternative challenge ...
  • Virulence of South African isolates of Haemophilus paragallinarum. Part 2: Naturally occurring NAD-independent field isolates 
    Bragg, R.R. (Robert Richard); 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)
    Naturally occurring NAD-independent variants of Haemophilus paragallinarum, which have been isolates from poultry showing clinical signs of infectious coryza, were used to determine their virulence using a newly developed ...
  • Virulence of South African isolates of Haemophilus paragallinarum. Part 3: Experimentally produced NAD-independent isolate 
    Taole, M.; Albertyn, J.; Van Heerden, E.; Bragg, R.R. (Robert Richard); 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)
    A NAD-dependent isolate 46 (C-3) of Haemophilus paragallinarum, which was previously demonstrated to be of high virulence, was transformed to NAD independence using a plasmid isolated from a naturally occurring NAD-independent ...
  • Viruses isolated from Culicoides midges in South Africa during unsuccessful attempts to isolate bovine ephemeral fever virus 
    Theodoridis, A.; Nevill, E.M.; Els, H.J.; Boshoff, S.T.; Steyn, P.J.J.; Bigalke, R.D.; Morren, A.J.; Verster, Anna J.M.; Verwoerd, Daniel Wynand; Walker, Jane B.; Cameron, Colin McKenzie; Gilchrist, Frances M.C. (Published by The Government Printer, Pretoria, 1979)
    Five viruses, unrelated to bovine ephemeral fever virus (BEFV), were isolated from Culicoides biting-midges collected during the summer months of the years 1968-69 and 1969-70 near a cattle herd in which cases of BEF ...