Browsing 1994 Onderstepoort Journal of Veterinary Research, Volume 61, 1994 by Issue Date

Browsing 1994 Onderstepoort Journal of Veterinary Research, Volume 61, 1994 by Issue Date

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  • Kok, D.J.; Fourie, L.J.; Oberem, P.T.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    A suspended-net technique was used to capture blackflies attracted to and engorging on Dorper and Merino sheep on irrigated pastures. Two bait animals of each breed were restrained individually in wire-mesh enclosures ...
  • 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 ...
  • Van Aswegen, G.; Schoeman, J.H.; De Vos, Valerius; Van Noorden, Susan; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Histological, immunocytochemical and immunofluorescence methods were employed to study the oesophagus and stomach of the elephant. The histological findings were in line with the situation in monogastric species like ...
  • Van Halderen, A.; Van Rensburg, W.J.J.; Geyer, A.; Vorster, J.H. (Jan Harm); Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Ovine keratoconjunctivitis was successfully reproduced in lambs under 1 year of age, in four separate transmission trials, by the use of mycoplasma isolates obtained from field outbreaks of ovine infectious keratoconjunctivitis. ...
  • Da Costa Mendes, V.M. (Vasco Manuel); De Beer, M.C.; Goosen, G.H.; Steele, A.D. (Andrew Duncan); Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Five cytopathic rotavirus strains were isolated in MA 104 cells from stool specimens of kids with diarrhoea. Pre-treatment of the virus with trypsin and incorporation of low levels of trypsin in the maintenance medium ...
  • 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 ...
  • Chadenga, V.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Tsetse-transmitted trypanosomosis remains a major constraint to the development of agriculture, particularly to that of livestock production in sub-Saharan Africa. It is estimated that 10 million km² of Africa are tsetse ...
  • 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 ...
  • 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 ...
  • Van Amstel, S.R.; Reyers, Fred; Myburgh, Elsbe; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The blood-gas status of seven sheep with experimentally induced heartwater during the acute and terminal stages was investigated. Changes in blood gas included a decline in arterial oxygen tension (pO₂) combined with a ...
  • 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 ...
  • Gummow, Bruce; Swan, Gerry E.; Du Preez, J.L.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The bioequivalence of the diminazene formulation Veriben (Centaur) was determined in cattle (n=10) by means of a single-dose, randomized cross-over experiment. The results of nine statistical procedures commonly used for ...
  • 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 ...
  • Connor, R.J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    The disease in cattle, called nagana in Zulu land, was linked with trypanosomal parasitaemia and tsetse flies. Nagana occurs in livestock throughout the tsetse belts of Africa. Wild animals are tolerant of trypanosomal ...
  • Du Plessis, J.L.; Boersema, B.R.; Van Strijp, M.F.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    High levels of seropositivity, in all probability attributable to Ehrlichia, were recorded in the serum of domestic ruminants throughout districts in South Africa where Amblyomma hebraeum, the vector of the heartwater ...
  • 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 ...
  • Fick, W.C.; Viljoen, G.J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Approximately 71 of the estimated 145 kilobase pairs of the genome of the South African isolate of lumpy-skin-disease virus, Neethling strain, was cloned into the plasmid vector pBluescribe. Selected clones were used in ...
  • Last, R.D.; Jardine, J.E.; Smit, Marie M.E.; Van der Lugt, Jaco J.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Two immunoperoxidase techniques, viz. avidin-biotin complex (ABC) and peroxidase-anti-peroxidase (PAP) procedures, were applied to paraffin-wax-embedded brain-tissue sections, from brains which had been fixed in 10% ...
  • Anonymous; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
  • 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 ...