• Subject index 

  Unknown; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)
• Author index 

  Verwoerd, Daniel Wynand (Pretoria : Government Printer, 1989)
• Hybridization model for Rhipicephalus appendiculatus and R. zambeziensis by glucose-P-isomerase isoenzymes 

  Wouters, G.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Hybrids between Rhipicephalus appendiculatus and R. zambeziensis were reared and glucose-phosphate-isomerase isoenzymes were resolved by agarose electrophoresis. By phenotyping hybrids in F₁ and F₂ generations autosomal ...
• Afrotropical Culicoides : C. (Avaritia) spinifer Khamala & Kettle, 1971, a name based on an artefact (Diptera : Ceratopogonidae) 

  Meiswinkel, R.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Culicoides (Avaritia) spinifer Khamala & Kettle, 1971, is made a junior subjective synonym of C. (A.) glabripennis Goetghebuer, 1935.
• Geographical distribution and habitat preferences of the invader freshwater snail species Lymnaea columella (Mollusca : Gastropoda) in South Africa 

  De Kock, K.N.; Joubert, P.H.; Pretorius, S.J.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  The present geographical distribution of Lymnaea columella, as recorded in the National Freshwater Snail Collection, is described and discussed. It appears that L. columella is the most successful colonist of all the ...
• The host status of the striped mouse, Rhabdomys pumilio, in relation to the tick vectors of heartwater in South Africa 

  Horak, Ivan Gerard; Howell, D.J.; Petney, T.N.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Striped mice, Rhabdomys pumilio, were trapped over a 17 month period in the Thomas Baines Nature Reserve in the eastern Cape Province of South Africa. Captured mice were placed in cages, over water, and naturally detaching ...
• Serological evidence of bovine leptospirosis in Malawi 

  Myburgh, Jan G.; Staley, G.P.; Van der Merwe, Sanette M.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Two hundred and seventy-five serum samples from cattle in Malawi were tested as a pilot survey for Leptospira antibody titres. Fifty-nine (21,4%) of the animals were positive for leptospirosis, while 35 (12,7%) animals ...
• An outbreak of contagious bovine pleuropneumonia in the Owambo Mangetti area of South West Africa/Namibia : microbiological, immunofluorescent, pathological and serological findings 

  Trichard, C.J.V.; Basson, P.A.; Van der Lugt, Jaco J.; Jacobsz, Elsie P.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  An outbreak of contagious bovine pleuropneumonia (CBPP) in the Owambo Mangetti area of South West Africa/Namibia in 1982 led to the slaughter of 3 153 cattle. The lungs of 266 of these animals were scrutinized for gross ...
• The biochemical differentiation between Salmonella and Citrobacter 

  Van der Walt, Martha L.; Steyn, Helena C.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  A number of bacterial isolates which could not be identified as either Salmonella or Citrobacter by conventional biochemical tests and could not be typed as Salmonella with available antisera, were further examined ...
• The effect of passive immunization on active immunity against Clostridium perfringens type D in lambs 

  Odendaal, M.W.; Visser, J.J.; Bergh, N.; Botha, W.J.S.; Verwoerd, Daniel Wynand (Pretoria : The Government Printer, 1989)

  Lambs in different stages of development of active immunity against Clostridium perfringens type D were treated with partially purified immunoglobulin in an attempt to superimpose a passive immunity on an existing or ...
• South African field strains of Haemonchus contortus resistant to the levamisole/morantel group of anthelmintics 

  Van Wyk, Jan Aucamp; Van Schalkwyk, Louwrens; Van Schalkwyk, P.C.; Visser, Evelyn L.; Alves, Regina M.R.; Gerber, H.M.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  A strain of Haemonchus contortus from the Pietermaritzburg district of Natal was found to be resistant to levamisole (geometric mean efficacy 76,5 %), morantel (41,9 %), the benzimidazoles (oxfendazole: 33,7 %) and rafoxanide ...
• Resistance of Nguni, Bonsmara and Hereford cattle to ticks in a Bushveld region of South Africa 

  Spickett, Arthur M.; De Klerk, Daniel G.; Enslin, C.B.; Scholtz, M.M.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Counts of engorged female ticks on naturally infested cattle over a 2 year period, showed that indigenous Nguni cattle harboured significantly fewer Amblyomma hebraeum, Boophilus decoloratus and Hyalomma spp. during periods ...
• Overberg Research Projects. VI. The biology and control of Oestrus ovis in sheep in the winter rainfall areas of the southern Cape 

  Louw, J.P.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Oestrus ovis was endemic on all the farms included in a survey conducted in the southern Cape, but each farm had its own unique seasonal pattern of infestation. Flock sheep were infested 10-12 months and tracers 5-9 months ...
• Availability of infective larvae of parasitic nematodes of sheep grazing on Kikuyu (Pennisetum clandestinum) pastures in the winter rainfall area 

  Reinecke, R.K.; Kirkpatrick, R.; Kriel, Anna M.D.; Frank, F.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Thirteen groups of 4 South African mutton Merinos grazed for 4 weeks with the flock on Kikuyu pastures and were slaughtered for total and differential worm counts at necropsy. Subsequently 12 groups of 8 week tracers grazed ...
• The structure of the shell and polar plugs of the egg of the whipworm, Trichuris trichiura (Nematoda : Trichuridae) from the Samango monkey (Cercopithecus albogularis) 

  Appleton, C.C.; White, Belinda J.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  The structure of the shell of the egg of Trichuris trichiura was examined using light microscopy as well as scanning and transmission electron microscopy. The results confirmed its three-layered structure and provided ...
• Some observations on the narcotizing ability of electric currents on the common carp Cyprinus carpio 

  Barham, W.T.; Schoonbee, H.J.; Visser, J.G.J.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Some effects of alternating current electronarcosis and of rectified current electronarcosis on C. carpio were investigated. In all instances recovery from narcosis was accompanied by convulsive spasms. Haemorrhaging of ...
• Serological evidence of Q fever in cattle in Malawi 

  Myburgh, Jan G.; Staley, G.P.; Chaparro, F.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  The serological prevalence of Coxiella burnetii in cattle in Malawi is unknown. Serum samples from 200 Malawian zebu cattle were tested for C. burnetii antibodies using the complement fixation test. The percentage of ...
• Comparative infection rates of Theileria parva lawrencei in salivary glands of Rhipicephalus appendiculatus and Rhipicephalus zambeziensis 

  Stoltsz, Wilhelm Heinrich; Blouin, Edmour F.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Three cattle, which had been experimentally infected with Theileria parva lawrencei and maintained as carriers of the infection, were each infested simultaneously with clean nymphal Rhipicephalus appendiculatus and ...
• The fine structure of developmental stages of Babesia caballi in the salivary glands of Hyalomma truncatum 

  Blouin, Edmour F.; De Waal, D.T.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  The development of Babesia caballi in the salivary glands of Hyalomma truncatum was studied at the electron microscopic level. Kinetes were first observed in the salivary glands of ticks on Day 2 of tick feeding and on ...
• Adverse effects of a proposed equine sublethal endotoxin model 

  Stadler, P.; Van Amstel, S.R.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1989)

  Commercially available Escherichia coli 055: B5 lipopolysaccharide was administered intravenously experimentally at a dosage of 10 µg/kg to 2 horses. Various clinical and clinico-pathological parameters were monitored ...

View more