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Browsing Research Articles (University of Pretoria) by UP Author "Petzer, Inge-Marie"
Now showing items 1-20 of 38
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Phophi, Lufuno; Petzer, Inge-Marie; Qekwana, Daniel Nenene (BioMed Central, 2019-11-26)BACKGROUND : Increased prevalence of antimicrobial resistance, treatment failure, and financial losses have been reported in dairy cows with coagulase-negative Staphylococcus (CoNS) clinical mastitis, however, studies on ...
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Magagula, Sabelo; Petzer, Inge-Marie; Famuyide, Ibukun Michael; Karzis, Joanne (Cambridge University Press, 2023-02)The research described in this Research Communication addresses the hypothesis that intramammary infections with Streptococcus uberis (S. uberis) are associated with biofilm formation, which limits antibiotic efficacy. ...
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Labuschagne, Christiaan; Karzis, Joanne; Britz, Hans; Petzer, Inge-Marie (MDPI, 2022-11-12)Water buffalo produce a tenth of milk for global human consumption. Non-aureus staphylococci (NAS) are among the most commonly isolated bacteria from mastitis in water buffalo and dairy cows. These results described the ...
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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; Karzis, Joanne; Van der Schans, Theodorus J.; Watermeyer, Johanna C.; Mitchell-Innes, Norman; Eloff, Stephanie; Fosgate, Geoffrey Theodore (Agricultural Research Council, ARC-OVI and the University of Pretoria, 2012-02-10)The aim of this study was to compare the effects of cryopreservation at approximately -196 °C in liquid nitrogen (N) and freezing at approximately -20 °C in a freezer, on the viability and survival of eight different ...
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Petzer, Inge-Marie; Karzis, Joanne; Meyer, Isabel A.; Van der Schans, Theodorus J. (AOSIS Open Journals, 2013-04-24)The indirect effects of mastitis treatment are often overlooked in cost-benefit analyses, but it may be beneficial for the dairy industry to consider them. The cost of mastitis treatment may increase when the duration ...
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Karzis, Joanne; Petzer, Inge-Marie (Agri Connect, 2012-08)No abstract available.
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Vermaak, Pieter; Petzer, Inge-Marie; Dzidic, Alen; Karzis, Joanne (Cambridge University Press, 2022-08)This research communication describes the effect of three automatic cluster removal (ACR) switch-point settings on machine-on time, overmilking duration, and the mean, peak-flow and overmilking vacuums. The objective was ...
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Vermaak, Pieter; Petzer, Inge-Marie; Karzis, Joanne (South African Society for Animal Science, 2022-10-13)The purpose of milking machines is to harvest milk at an optimum speed while maintaining cow comfort and preserving teat defence mechanisms against the invasion of mastitis pathogens, thus making machine settings critical ...
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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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Petzer, Inge-Marie; Karzis, Joanne; Lesosky, Maia; Watermeyer, Johanna C.; Badenhorst, Renette (BioMed Central, 2013-03-15)BACKGROUND: Heifers can calve down with intramammary infections (IMI) and udder damage. This will have a negative impact on their longevity, future milk yield and financial return. Co-housed pre-weaned calves that are ...
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Motaung, Thabiso Eric; Petrovski, Kiro R.; Petzer, Inge-Marie; Thekisoe, Oriel; Tsilo, Toi J. (Cambridge University Press, 2017-06)Bovine mastitis is an important animal production disease that affects the dairy industry globally. Studies have estimated the prevalence of this disease in approximately 30% of African countries, with the highest prevalence ...
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Akinboye, Ayodele O.; Famuyide, Ibukun Michael; Petzer, Inge-Marie; McGaw, Lyndy Joy (MDPI, 2023-04)Please read abstract in article.
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Akinboye, Ayodele O.; Makhubu, Fikile N.; Karzis, Joanne; Petzer, Inge-Marie; McGaw, Lyndy Joy (Elsevier, 2024-03)Bovine mastitis is a critical pathology in global dairy herds, causing economic losses due to decreased production and increased culling. The continuous use of conventional antibiotics has led to antimicrobial resistance ...
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Erhabor, Rosemary Chinelo; Erhabor, Joseph Omorogiuwa; Nkadimeng, Sanah Malomile; Petzer, Inge-Marie; Dzoyem, Jean Paul; McGaw, Lyndy Joy (Elsevier, 2024-02)Bovine mastitis, caused mostly by Staphylococcus species, has gained global importance owing to the increasing prevalence of multi-drug resistant bacteria, which comprise a risk to food security and public health. In this ...
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Ogbuadike, Eucharia Chika; Nkadimeng, Sanah Malomile; Igwe, Chima C.; Dzoyem, Jean Paul; Qekwana, Daniel Nenene; Petzer, Inge-Marie; McGaw, Lyndy Joy (Elsevier, 2023-03)Mastitis is a painful inflammatory condition, commonly resulting from infections caused by Staphylococcus aureus and other pathogens. In this study, antimicrobial, anti-biofilm and anti-quorum sensing activities of selected ...
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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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Ferreira, Gert M.; Petzer, Inge-Marie (AOSIS Open Journals, 2019-10)Mastitis is the most costly disease of dairy cows. A pro-active approach includes insuring adequate levels of selective trace minerals. The aim of this study was to determine the effect of two different commercially ...
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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 ...
Now showing items 1-20 of 38