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AbstractFull Text

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 to dairy cows in 19 South African and one Zambian dairy herds...

Author(s)
Karzis, J.; Petzer, I. M.; Donkin, E. F.; Naidoo, V.
Publisher
AOSIS OpenJournals, Tygervalley, South Africa
Citation
Journal of the South African Veterinary Association, 2018, 89, pp a1490
Abstract

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 the California mastitis test (CMT) in commercial dairy cattle in South Africa...

Author(s)
Fosgate, G. T.; Petzer, I. M.; Karzis, J.
Publisher
Elsevier Ltd, Oxford, UK
Citation
Veterinary Journal, 2013, 196, 1, pp 98-102
Abstract

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 fed fresh milk have the opportunity to suckle each other's teats and may infect...

Author(s)
Petzer, I. M.; Karzis, J.; Lesosky, M.; Watermeyer, J. C.; Badenhorst, R.
Publisher
BioMed Central Ltd, London, UK
Citation
BMC Veterinary Research, 2013, 9, 49, pp (15 March 2013)
Abstract

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 mastitogenic bacteria inoculated in milk. Bacteria were frozen at approximately...

Author(s)
Petzer, I. M.; Karzis, J.; Schans, T. J. van der; Watermeyer, J. C.; Mitchell-Innes, N.; Eloff, S.; Fosgate, G. T.
Publisher
Onderstepoort Veterinary Institute, Onderstepoort, South Africa
Citation
Onderstepoort Journal of Veterinary Research, 2012, 79, 1, pp Article 2
AbstractFull Text

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 and their pathogenicity under field conditions. Milk samples were obtained ...

Author(s)
Petzer, I. M.; Karzis, J.; Watermeyer, J. C.; Schans, T. J. van der; Reenen, R. van
Publisher
South African Veterinary Association, Pretoria, South Africa
Citation
Journal of the South African Veterinary Association, 2009, 80, 1, pp 17-22
Abstract

Corynebact. pyogenes has been found associated with various suppurative processes and certain types of mastitis on the Witwatersrand. In young heifers in several dairies an induration has developed on the supra-posterior aspect of the udder usually terminating in suppuration and subsequent rapid...

Author(s)
MARTINAGLIA, G.
Citation
Journal of the South African Veterinary Medical Association, 1935, 6, pp 89-90
Abstract

II. Epidemiologkai studies on MASTITIS in cattle were continued. Penicillin was used in an attempt to eradicate infections of Str. agalactiae and of staphylococci from the udder. Complement fixation tests for TUBERCULOSIS in cattle were carried out using an antigen prepared from distilled water...

Publisher
Canberra: L. F. Johnston, Commonwealth Govt. Printer.,
Citation
Nineteenth annual report of the Council for Scientific and Industrial Research, for the year ended 30th June, 1945., 1945, pp 164 pp.

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