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Browsing Production Animal Studies by UP Author "Donkin, Edward Francis"
Now showing items 1-13 of 13
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Karzis, Joanne; Petzer, Inge-Marie; Donkin, Edward Francis; Naidoo, Vinny; Etter, Eric Marcel Charles (AOSIS OpenJournals, 2019-07-10)South Africa is a large country of approximately 1.22 million km2, made up of nine provinces with three climatic zones. Farming in the country is mostly defined by regional differences. Of the different organisms isolated ...
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Petzer, Inge-Marie; Etter, Eric Marcel Charles; Donkin, Edward Francis; Webb, E.C. (Edward Cottington); Karzis, Joanne (Elsevier, 2017-12)An innovative method was investigated to aid in the elimination of Staphylococcus aureus (S. aureus) intramammary infections (IMI) from dairy herds. A stochastic model explore the economic benefit of three-day or eight-day ...
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Karzis, Joanne; Donkin, Edward Francis; Petzer, Inge-Marie (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2007-06)The California Milk Cell Test (CMCT) and somatic cell counts (SCC) on their own were not reliable methods in the identification of subclinical mastitis in the dairy goats studied and should be accompanied by microbiological ...
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Petzer, Inge-Marie; Donkin, Edward Francis; Du Preez, E.; Karzis, Joanne; Van der Schans, Theodorus J.; Watermeyer, Johanna C.; Van Reenen, R. (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2008-06)This study investigated the withdrawal periods (WP) of two intramammary antibiotics Cloxamast LC (Intervet SA) and Spectrazol Milking Cow (Schering-Plough Animal Health) in dairy goats and compared them to those recommended ...
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Karzis, Joanne; Donkin, Edward Francis; Petzer, Inge-Marie (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2007-09)The length of the antibiotic withdrawal period after intramammary treatment was influenced by the milk yield of dairy goats during this trial. Shorter withdrawal periods were seen in relatively high yielding dairy goats ...
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Karzis, Joanne; Donkin, Edward Francis; Petzer, Inge-Marie (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2007-09)Intramammary antibiotics are registered and tested for use in dairy cattle. This study investigated withdrawal periods of three intramammary antibiotics (Curaclox LC [Norbrook Pharmacia AH]), Spectrazol Milking Cow ...
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Petzer, Inge-Marie; Karzis, Joanne; Donkin, Edward Francis; Webb, E.C. (Edward Cottington) (AOSIS OpenJournals, 2016-08-30)A dedicated udder health diagnostic programme was developed and used over a 15-year period in South Africa to analyse milk samples based on microbiological and cytological patterns within various groups and for individual ...
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Karzis, Joanne; Petzer, Inge-Marie; Donkin, Edward Francis; Naidoo, Vinny (AOSIS, 2018-05)Antibiotic resistance of strains of Staphylococcus aureus isolated from bovine milk is of concern internationally. The objective of this study was to investigate trends of resistance of S. aureus to antibiotics administered ...
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Petzer, Inge-Marie; Karzis, Joanne; Donkin, Edward Francis; Webb, E.C. (Edward Cottington); Etter, Eric Marcel Charles (AOSIS OpenJournals, 2017-03-24)The objective of the study was to establish an operational somatic cell count (SCC) threshold to predict the presence of intramammary infection (IMI) in composite milk samples and compare findings with those in quarter ...
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Karzis, Joanne; Petzer, Inge-Marie; Donkin, Edward Francis; Naidoo, Vinny; Etter, Eric Marcel Charles (MDPI, 2020-09)Antibiotic resistance has been reported since the 1940s in both human and veterinary medicine. Many years of monitoring milk samples in South Africa led to identification of a novel maltose-negative Staphylococcus aureus ...
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Petzer, Inge-Marie; Karzis, Joanne; Donkin, Edward Francis; Webb, E.C. (Edward Cottington); Etter, Eric Marcel Charles (AOSIS OpenJournals, 2017-04-13)The objective of this study was to determine whether somatic cell count (SCC) was an effective test, with a sensitivity exceeding 85%, to determine species-specific bacterial infections. In addition, the relation between ...
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Petzer, Inge-Marie; Donkin, Edward Francis; Du Preez, E.; Karzis, Joanne; Van der Schans, Theodorus J.; Watermeyer, Johanna C.; Van Reenen, R. (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2008-06)The value of electric conductivity (EC), California Milk Cell Test (CMCT) and somatic cell count (SCC) as diagnostic tools was investigated in dairy goats. Conductivity colour reading correlated with SCC. Milk samples with ...
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Karzis, Joanne; Donkin, Edward Francis; Petzer, Inge-Marie (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2007-12)The aim of this study was to determine withdrawal periods (WP) and tissue irritation after administration of three intramammary antibiotics [Curaclox LC (Norbrook (ARK AH)], Spectrazol Milking Cow (Schering-Plough AH) ...
Now showing items 1-13 of 13