Browsing Onderstepoort Journal of Veterinary Research by Title

Browsing Onderstepoort Journal of Veterinary Research by Title

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  • Effect of heat-stress on conception in a dairy-herd model in the Natal highlands of South Africa 
    Du Preez, J.H.; Willemse, J.J.C.; Van Ark, H.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1994)
    Regression models are proposed for predicting conception rate in a dairy herd under South African and especially Natal conditions. Conception rate (CR%) was related to mean monthly temperature-humidity index (THI) by ...
  • The effect of high levels of sodium bicarbonate in the drinking water of sheep on rumen function 
    Grosskopf, Johannes Friedrich Wagner; Briel, R.J.J.; Jansen, B.C. (Pretoria : The Government Printer, 1966)
    Two groups of rumen fistulated sheep of two each fed on lucerne hay ad lib. (supra maintenance) and teff hay ad lib. (sub-maintenance) respectively, were offered drinking water containing different levels of bicarbonate, ...
  • Effect of host age in the distribution of adult Trichinella zimbabwensis in the small intestines of golden hamsters (Mesocricetus auratus) and Balb C mice 
    Mukaratirwa, S.; Nkulungo, E.; Matenga, E.; Bhebhe, E.; 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)
    Golden hamsters (Mesocricetus auratus) and Balb C mice were experimentally infected with Trichinella zimbabwensis to determine the effect of host age in the distribution of adult stages in the small intestines. The hamsters ...
  • The effect of immunosuppression on the development of immunity to fowl typhoid 
    Brett, O.L.; Fuls, W.J.P.; Cameron, Colin McKenzie; De Kock, V.E.; Verster, Anna J.M.; Walker, Jane B.; Bigalke, R.D.; Cameron, Colin McKenzie (Pretoria : The Government Printer, 1974)
    Chickens which were given cyclophosphamide during the first three to five days of life showed a marked depression in their humoral antibody response to sheep erythrocytes and Brucella antigen. Their ability to develop ...
  • The effect of incubation and prefeeding of infected Rhipicephalus simus nymphae and adults on the transmission of Anaplasma marginale 
    Potgieter, F.T.; Van Rensburg, L.; 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)
    Two batches of unfed Rhipicephalus simus nymphae carrying Anaplasma marginale were incubated for 72h and 96h respectively at 37°C. Fifty ticks were triturated at a time and the homogenates were used to infect susceptible ...
  • The effect of inflammation on the development of immunity to anthrax in guinea pigs 
    Sterne, Max; Du Toit, P.J. (Pretoria : The Government Printer, 1948)
    1. An acute inflammation has the same general inhibitory effect on immunizing power that it has on the virulence of anthrax strains. 2. Irritant excipients have the same local stimulating effect on small immunizing doses ...
  • The effect of inflammation on the survival of guinea pigs infected with anthrax 
    Sterne, Max; Du Toit, P.J. (Pretoria : The Government Printer, 1948)
    (1) The development of anthrax in guinea pigs is slowed down if an acute inflammation accompanied by an oedema is provoked elsewhere in the body. Thus the injection of saponin into a fore-limb or into the peritoneal cavity ...
  • The effect of intermittent starvation on calcification, food utilization, and tissue composition 
    Kellermann, J.H.; Du Toit, P.J. (Pretoria : Government Printer, 1939)
    Data are presented on the effects of short intermittent fasts on bone calcification, food utilization and tissue composition. No significant differences were found between the percentage ash of femurs of males versus females ...
  • Effect of levamisole on immunity to Corynebacterium pseudotuberculosis in mice and sheep 
    Cameron, Colin McKenzie; 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. (Pretoria : The Government Printer, 1977)
    The stimulating effect of levamisole on immunity to Corynebacterium pseudotuberculosis in mice was marginal, while no enhancement of immunity could be detected in sheep. The conclusion was reached that, as levamisole has ...
  • The effect of Lindane vapour on stored product insects 
    Fiedler, O.G.H.; Du Toit, R.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E. (Published by The Government Printer, Pretoria, 1954)
    To assess the insecticidal effect of vapour originating from small quantities of Lindane at a temperature of 25°C. (77° F.) twelve series of experiments were conducted in which stored product insects in closed fumigation ...
  • 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 ...
  • Effect of pavetamine on protein synthesis in rat tissue 
    Prozesky, Leon; Schultz, R.A. (Rowena Anitra); Fourie, Niel; Basson, Karin M.; Labuschagne, Leonie; 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)
    Pavetamine, the active principle of plants causing gousiekte in ruminants, was found in this study to be an inhibitor of protein synthesis in the rat heart. Sprague-Dawley rats were injected intra-peritoneally with 8-10 ...
  • The effect of predosing calves with Trichostrongylus axei on subsequent challenge with Haemonchus placei 
    Reinecke, R.K.; De Villiers, I.L.; Joubert, Gerda; 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)
    Twelve calves were dosed with 40 000 and a further 12 with 80 000 infective larvae of Trichostrongylus axei respectively. These 2 groups and a control group were subsequently dosed with 50 000 infective larvae of Haemonchus ...
  • The effect of stress on udder health of dairy cows 
    Giesecke, W.H.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1985)
    The appropriate literature has been reviewed for the purpose of defining the phenomenon of stress in lactating dairy cattle, establishing a baseline concept of lactation stress and emphasizing the most significant aspects ...
  • The effect of supplementing lucerne with cystine and methionine on the growth of rats 
    Smuts, D.B.; Marais, J.S.C.; Du Toit, P.J. (Pretoria : Government Printer, 1939)
    By means of the paired feeding method it was shown that methionine supplemented lucerne significantly better than cystine. If lucerne is supplemented by methionine plus cystine and compared with lucerne supplemented by ...
  • The effect of supplements of different forms of sulphur to the diet upon the wool of Merino sheep 
    Van Wyk, C.M.; Botha, M.L.; Bekker, J.G.; Du Toit, P.J. (Pretoria : Government Printer, 1935)
    (1) Six groups of young wethers were kept on a production ration for two years. During the second year five of the groups received supplements of sulphur and of compounds containing sulphur, the sixth group acting as ...
  • The effect of temperature on the frons width in males of Stomoxys calcitrans Linnaeus (Diptera : Muscidae) 
    Sutherland, B.; 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)
    Laboratory experiments established that males of Stomoxys calcitrans, raised at a high temperature (30°C), had frons widths that were very significantly smaller (P=0,01) than those of males raised at a lower temperature ...
  • The effect of temperature on the in vitro transcriptase reaction of bluetongue virus, epizootic haemorrhagic disease virus and African horsesickness virus 
    Huismans, H. (Henk), 1942-; Van Dijk, A.A.; 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)
    Virions of bluetongue virus (BTV), epizootic haemorrhagic disease virus (EHDV) and African horsesickness virus (AHSV) can be converted to core particles by treatment with chymotrypsin and magnesium. The conversion is ...
  • Effect of the South African asinine-94 strain of equine arteritis virus (EAV) in pregnant donkey mares and duration of maternal immunity in foals 
    Paweska, Janusz Tadeusz; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1997)
    Clinical, virological and serological responses were investigated in five pregnant donkey mares after experimental exposure to the South African asinine-94 strain of equine arteritis virus (EAV), and the duration of ...
  • The effect of three bufadienolide cardiac glycosides on contraction of isolated rat jejunum 
    Botha, C.J. (Christoffel Jacobus); Gehring, Ronette; Van Rooyen, J.M.; Venter, D.; 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)
    Three cardiac glycosides were screened for pharmacological effects on isolated rat jejunum. The contraction of rat jejunum with epoxyscillirosidin, a non-cumulative bufadienolide, and cotyledoside and tyledoside D, both ...