Browsing 1987 Onderstepoort Journal of Veterinary Research, Volume 54, 1987 by Issue Date

Browsing 1987 Onderstepoort Journal of Veterinary Research, Volume 54, 1987 by Issue Date

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  • Soll, M.D.; Carmichael, I.H.; Gross, Sheila J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    The efficacy of ivermectin, administered in a sustained release formulation by intraruminal pumps at approximate daily dose rates of 20, 40 and 60 µg/kg, was evaluated in 16 cattle against induced infestations of 3 strains ...
  • Neser, J.A.; Kotze, C.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Increased bleeding time, impaired blood clot retraction and decreased thrombocyte aggregation were observed in pigs infected with virulent haemadsorbing and non-haemadsorbing African swine fever virus isolates. These ...
  • Hunter, Pamela; Van der Vyver, F.H.; Henton, Marijke M.; Herr, S.; De Lange, J.F.; Selmer-Olsen, Anne; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    The incidence of isolation of Leptospira sp. from the kidneys of slaughter pigs with “white-spot" macroscopic lesions was determined. Histology and general bacteriology were performed. Leptospira pomona was isolated from ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Logan, L.L.; Birnie, E.F.; Mebus, C.A.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Cross-immunity studies in goats and mice using 4 isolates of Cowdria ruminantium, 2 from the Republic of South Africa (Kwanyanga and Kümm), 1 from the Republic of Mali (Mali 1), and 1 from Guadeloupe (Garde1), demonstrated ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Bezuidenhout, J. Dürr; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Heartwater has been transmitted experimentally by 12 Amblyomma species. Their importance depends on the extent of their distribution, adaptation to domestic stock and their efficacy as vectors. Except for one report of ...
  • Cameron, Colin McKenzie; Barnard, B.J.H.; Erasmus, Erna; Botha, W.J.S.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    A stable oil emulsion rabies vaccine with a low viscosity was composed by a formula previously employed for Newcastle disease vaccine. Cattle developed high and sustained antibody levels, and guinea pigs were found to ...
  • Schneider, D.J.; Green, Jennifer R.; Collett, M.G.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Following a field outbreak of hepatogenous photosensitivity in sheep, an identical condition was reproduced experimentally by dosing 2 sheep with green, homogenized, Nidorella foetida material, collected from the camp where ...
  • Potgieter, F.T.; Van Rensburg, L.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Anaplasma centrale was isolated from a field collection of Rhipicephalus simus. Transstadial transmission of A. centrale with adult ticks was demonstrated, but the infection was not carried transovarially. Ticks from this ...
  • Durand, Anette M.; Barnard, Marie-Luise; Swanepoel, Martha L.; Engelbrecht, Marie M.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Resistance to 20 antibiotics of 128 Salmonella and 97 Escherichia coli isolates from various registrable farm feeds was determined. A high frequency of comparatively low levels of resistance was found in both the Salmonella ...
  • Nevill, E.M.; Wilkins, C.A.; Zakrisson, G.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Ivermectin treatment of all cattle on a badly infected farm failed to interrupt the transmission of P. bovicola, even though ovipositional blood spots were drastically reduced in numbers for an entire summer season following ...
  • Visser, Elizabeth S.; Ambrosio, R.E.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Anaplasmosis can be diagnosed either by immunological techniques or by direct microscopic examination of blood smears. Both methods are time-consuming and labour intensive. The use of DNA probes in an hybridization assay ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Oberem, P.T.; Bezuidenhout, J. Dürr; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    The importance of further research on the susceptibility of wild hosts to Cowdria ruminantium infection is discussed. The literature is surveyed and an attempt is made to divide the various species described into susceptible ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Stewart, C.G.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Mice develop a specific immune response following infection with the mice strains of heartwater. In the case of the Kümm strain the agent can persist in some tissues for up to 365 days. Transfer of spleen cells from immune ...
  • Ambrosio, R.E.; Potgieter, F.T.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    The Tm value of DNA from Anaplasma centrale and Anaplasma marginale was found to be 87,1 °C and 89,3 °C, respectively. The G + C content, calculated from the Tm, was 45,1% for A. centrale and 48,5 % for A. marginale. ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Matheron, G.; Barre, N.; Camus, E.; Gogue, J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    The resistance rate of different populations of the same breed of creole Guadeloupean goats to Cowdria ruiminatium infection varied greatly depending on the previous heartwater history of each population. After experimental ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Camus, E.; Barre, N.; Bigalke, R.D. (Pretoria : Government Printer, 1987)
    At present, heartwater in the Caribbean is known with certainty only on Guadeloupe, Marie Galante and Antigua; the first 2 islands are widely infected. The most important factors responsible for particular aspects of ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Malan, Letitia; Du Plessis, J.L.; Bigalke, R.D. (Pretoria : Government Printer, 1987)
    In an epidemiological study undertaken on 23 farms where heartwater occurs endemically, it was found that on an overall average, antibodies to Cowdria ruminantium were detected in 64,3 % of the cattle, 6 adult Amblyomma ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Gothe, R.; Bigalke, R.D. (Pretoria : Government Printer, 1987)
    According to their activity profiles tick pheromones can be characterized as assembly pheromones, aggregation/attachment pheromones, pre-attachment or pre-feeding pheromones, attractant sex pheromones, contact sex pheromones, ...
  • Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Barre, N.; Camus, E.; Bigalke, R.D. (Pretoria : Government Printer, 1987)
    Experiments were conducted with Creole goats and Amblyomma variegatum ticks in Guadeloupe to investigate whether it is possible to transmit Cowdria ruminantium to susceptible hosts with nymphs fed in the larval stage on ...
  • Coetzee, Bridgette B.; Stanford, G.D.; Davis, D.A.T.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    A strain of Boophilus decoloratus, resistant to fenvalerate, was subjected to larval immersion, adult immersion and stall tests using the following classes of ixodicides : organochlorines, organophosphates, a diamidide and ...