Browsing 1987 Onderstepoort Journal of Veterinary Research, Volume 54, 1987 by Title

Browsing 1987 Onderstepoort Journal of Veterinary Research, Volume 54, 1987 by Title

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  • The taxonomic status of the causative agent of heartwater 
    Scott, G.R.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    A fresh pragmatic classification of the rickettsias has been derived by applying the simplest techniques of numerical taxonomy. One order, the Rickettsiales, containing 3 families, the Rickettsiaceae, Phagosomaphilaceae, and ...
  • Theoretical aspects of the enzyme-linked immunosorbent assay technique and its use in the detection of Cowdria ruminantium antigen and antibody in reacting animals 
    Neitz, Albert Walter Herman; Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Viljoen, Gerrit Johannes; Vermeulen, N.M.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Numerous parameters affect the enzyme-linked immunosorbent assay activity and the assay conditions must therefore be carefully controlled to obtain reproducible results. These parameters include temperature, pH, ionic ...
  • Tick pheromones 
    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, ...
  • Tick transmission of Anaplasma centrale 
    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 ...
  • The tick vectors of Cowdria ruminantium (Ixodoidea, Ixodidae, genus Amblyomma) and their distribution 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Walker, Jane B.; Olwage, A.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Twelve species of Amblyomma are presently known to be capable of transmitting Cowdria ruminantium. Of these A. variegatum is the most important and widely distributed vector in Africa. It has also extended its range ...
  • The transstadial transmission of Babesia caballi by Rhipicephalus evertsi evertsi 
    De Waal, D.T.; Potgieter, F.T.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Rhipicephalus evertsi evertsi larvae were fed on the ears of rabbits. Seven days after larval infestation, unfed, newly moulted nymphae were manually removed to infest a splenectomized donkey showing a patent Babesia ...
  • The treatment of heartwater 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Van Amstel, S.R.; Oberem, P.T.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    This paper reviews the available literature on the treatment of heartwater and draws comparisons with results obtained from recent work on experimentally-induced heartwater in sheep, calves and mice.
  • Two field strains of Haemonchus contortus resistant to refoxanide 
    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 ...
  • Ultrastructural features of Cowdria ruminantium in midgut epithelial cells and salivary glands of nymphal Amblyomma hebraeum 
    Kocan, Katherine M.; Bezuidenhout, J. Dürr; Hart, Alet; Bigalke, R.D. (Pretoria : Government Printer, 1987)
    Colonies of Cowdria ruminantium were studied in midgut epithelial cells and salivary gland acini of nymphal Amblyomma hebraeum that were infected experimentally as larvae. Colonies were found in both tissues and studied ...
  • The use of electro-encephalography and brain biopsy in the clinical diagnosis of heartwater 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Van Amstel, S.R.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Both electro-encephalography and brain biopsy were examined as possible aids in the confirmation of a clinical diagnosis of heartwater in field cases. Results showed that electro-encephalographic changes associated with ...
  • The use of electronarcosis as anaesthetic in the cichlid, Oreochromis mossambicus (Peters). I. General experimental procedures and the role of fish length on the narcotizing effects of electric currents 
    Barham, W.T.; Schoonbee, H.J.; Visser, J.G.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Procedures to narcotize fish by means of alternating or direct electrical currents are described and a method of evaluating the narcotic effects on fish of electrical currents is detailed. The role of fish length on the ...
  • The use of flumethrin 1% pour-on for the control of Amblyomma spp. in various Southern African countries 
    Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Hamel, H.D.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Efficacy trials with flumethrin 1% pour-on were conducted in 9 different areas in 3 southern and central African countries against Amblyomma hebraeum and A. variegatum on cattle. A dose volume of 10 ml/100 kg body mass ...
  • The use of meso-erythritol sensitivity discs in the typing of Brucella strains 
    Pieterson, P.M.; Te Brugge, Lesley A.; Herr, S.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)
    Sensitivity discs containing 1 and 2 mg meso-erythritol were found to give comparable results to the use of meso-erythritol incorporated into growth medium at 1 and 2 mg/ml. The discs proved easy and efficient when used ...
  • Welcoming address to the workshop on heartwater: past, present and future 
    Van der Merwe, F.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)