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Browsing South African National Veterinary Repository by Author "Giesecke, W.H."
Now showing items 1-20 of 20
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Ogonowski, K.; Barnard, Marie-Luise; Giesecke, W.H.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1984)An investigation of poultry litter intended for use in farm feeds showed that 0,37 %, 0,49 %, 0,25 %and 12,3 % of the 813 samples tested were contaminated with Clostridium spp., haemolytic Escherichia coli, Staphylococcus ...
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Cyclic fluctuations in acetone concentrations in the blood and milk of clinically healthy dairy cows Winterbach, Hanlie Evelyn Kathleen; Petzer, Inge-Marie; Apps, P.J.; Giesecke, W.H.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1993)Milk samples were taken daily or twice weekly, and blood samples twice weekly, from six clinically healthy dairy cows. Acetone concentration was determined by a new headspace gas-chromatographic method that proved to be ...
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Giesecke, W.H.; Van den Heever, Louwrens Wepener; Du Toit, I.J.; Beyer, Maria C. E.; De Kock, V.E.; De Lange, M.; Bigalke, R.D.; Howell, P.G.; Reinecke, R.K.; Walker, Jane B. (Published by the Government Printer, Pretoria, 1973)A critically comparative investigation was performed on 228 quarter samples from 26 Friesland-type dairy cows respectively to evaluate the diagnostic value of conventional direct and indirect cytological methods and a ...
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Giesecke, W.H.; Van den Heever, Louwrens Wepener; De Kock, V.E.; Bigalke, R.D.; Cameron, Colin McKenzie; Verster, Anna J.M.; Walker, Jane B. (Pretoria : The Government Printer, 1974)From a review of literature on bovine mastitis published between 1833 and 1973 it is concluded that although herd control has caused a shift of emphasis from the clinical to the subclinical forms, diagnostic criteria have ...
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Giesecke, W.H.; Viljoen, M.H.; De Kock, V.E.; Bigalke, R.D.; Cameron, Colin McKenzie; Verster, Anna J.M.; Walker, Jane B. (Pretoria : The Government Printer, 1974)The diagnostic accuracy of conventional methods for the diagnosis of subclinical mastitis, such as the direct microscopic count (DMC) and electronic cell count (ECC) either used alone or in combination with bacteriological ...
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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 ...
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Theodoridis, A.; Giesecke, W.H.; Du Toit, I.J.; De Kock, V.E.; De Lange, M.; Bigalke, R.D.; Howell, P.G.; Reinecke, R.K.; Walker, Jane B. (Pretoria : The Government Printer, 1973)The effect of ephemeral fever (EF) on the lactation, pregnancy and fertility of 19 dairy cows was studied. During the febrile reaction milk yields were reduced by an average of 58,7 ± 22 %, depending on the stage of lactation ...
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Giesecke, W.H.; Spickett, Arthur M.; Durand, Anette M.; Van Staden, J.J.; Erasmus, J.A.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1984)An investigation undertaken with the aid of scanning electron microscopy (SEM) on new and used teat cup liners revealed the generally poor quality of luminal surfaces. Even those of the brand-new distributor controls ...
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Petzer, Inge-Marie; Giesecke, W.H.; Durand, Anette M.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1984)Individual quarter samples from some 19 cows on average were investigated monthly over 12 months for determining the udder health status of cows and the glucose concentrations of foremilk and strippings. Foremilk showed ...
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Du Preez, J.H.; Giesecke, W.H.; Hattingh, P.J.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)The Livestock Weather Safety Index (LWSI) indicates that in large areas of South Africa and South West Africa / Namibia and for prolonged periods of the year warm conditions are causing heat stress in food producing animals, ...
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Du Preez, J.H.; Hattingh, P.J.; Giesecke, W.H.; Eisenberg, B.E.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)Temperature-humidity index (THI) values applicable to South Africa and Namibia have been established during this investigation for each month of the year by means of computerized modelling and mapping techniques. The data ...
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Du Preez, J.H.; Giesecke, W.H.; Hattingh, P.J.; Eisenberg, B.E.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)November-March are the hottest months of the year with the highest monthly mean "temperature-humidity index" (THI) in South Africa and Namibia. These 5 months are associated with severe heat stress in dairy cattle, are of ...
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Kowalski, Z.E.; Giesecke, W.H.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1986)A high performance, liquid chromatographic, gradient method with post-column derivatization and highly sensitive fluorescence detection has been developed for the determination of reducing sugars, such as lactose, galactose ...
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Kowalski, Z.E.; Giesecke, W.H.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1986)A high performance, liquid chromatographic, gradient method with post-column derivatization and highly sensitive fluorescence detection has been developed for the determination of reducing sugars, such as lactose, galactose ...
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Kowalski, Z.E.; Franz, R.C.; Coetzee, W.J.C.; Giesecke, W.H.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1984)Using the composite fibrin plates method, plasminogen activator (PA) activity was found in secretions from clinically normal, mastitic, lactating and dried-off udders of dairy cows. The possible involvement of the fibrinolytic ...
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Durand, Anette M.; Giesecke, W.H.; Barnard, Marie-Luise; Van der Walt, Martha L.; Steyn, Helena C.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)The prevalence of Salmonella in southern Africa in farm feeds and by-products of animal origin during 1982-1988 was determined. Salmonella occurred in 5,18% of the farm feed samples and in 9,54% of the by-product samples. ...
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Van den Heever, Louwrens Wepener; Du Toit, I.J.; Giesecke, W.H.; De Kock, V.E.; De Lange, M.; Bigalke, R.D.; Howell, P.G.; Reinecke, R.K.; Walker, Jane B. (Published by the Government Printer, Pretoria, 1972)Phage typing of 187 isolates of S. aureus showed that a small proportion of udder infections was caused by "human" strains of S. aureus and the majority by "bovine" strains. A total of 35 different phage patterns was ...
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Giesecke, W.H.; 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. (The Government Printer, Pretoria, 1978)Eight different mastitis remedies were administered intracisternally on a rotational basis to the 48 quarters of 12 mastitis negative cows. The resulting intramammary reactions were monitored by determining the Somatic ...
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Giesecke, W.H.; Korybut-Woroniecki, P.A.; Kowalski, Z.E.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)The investigation involved 4 mastitis-free cows, exposed to 168 h of suspended milking to induce prolonged milk stasis and premature mammary regression during mid-lactation. After 48 h the milk stasis elicited mastitis-like ...
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Giesecke, W.H.; Korybut-Woroniecki, P.A.; Kowalski, Z.E.; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)This investigation has shown that collateral intramammary reactions (CIR's) occur when secretory disturbances in one quarter lead to corresponding changes in one or more of the other, unperturbed, quarters of the same ...
Now showing items 1-20 of 20