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Browsing Research Articles (Production Animal Studies) by UP Author "Karzis, Joanne"
Now showing items 1-20 of 23
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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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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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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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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; Watermeyer, Johanna C.; Badenhorst, Renette (Agri Connect, 2012-07)Udder infections in pregnant heifers in South Africa are a much bigger challenge than most milk producers realise.
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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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Fosgate, Geoffrey Theodore; Petzer, Inge-Marie; Karzis, Joanne (Elsevier, 2013-04)Screening tests for mastitis can play an important role in proactive mastitis control programs. The primary objective of this study was to compare the sensitivity and specificity of milk electrical conductivity (EC) to ...
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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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Petzer, Inge-Marie; Labuschagne, Christiaan; Phophi, Lufuno; Karzis, Joanne (AOSIS OpenJournals, 2022-07-27)Detailed information on specific species of non-aureus staphylococci (NAS) has become a necessity for effective udder health control programs in South Africa. The main objective of this preliminary study was to identify ...
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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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Akinboye, Ayodele O.; Adeyemo, Rasheed Omotayo; Karzis, Joanne; Petzer, Inge-Marie; McGaw, Lyndy Joy (Elsevier, 2024-03)Bovine mastitis, an inflammatory condition affecting the mammary glands of dairy cattle, poses a significant economic burden on the dairy industry. Staphylococcus species, Streptococcus species and Escherichia coli are ...
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Petzer, Inge-Marie; Karzis, Joanne; Watermeyer, Johanna C.; Van der Schans, Theodorus J.; Van Reenen, R. (South African Veterinary Association, 2009)The aim of this study was to retrospectively analyse the results of milk samples obtained from South African dairy herds during the period 1996 to April 2007 in order to identify possible trends in isolates of microorganisms ...
Now showing items 1-20 of 23