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Browsing Research Articles (Production Animal Studies) by UP Author "Watermeyer, Johanna C."
Now showing items 1-7 of 7
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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; 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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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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Petzer, Inge-Marie; Lourens, D.C. (Dirk Cornelius); Van der Schans, Theodorus J.; Watermeyer, Johanna C.; Van Reenen, R.; Rautenbach, G.H.; Thompson, P.N. (Peter N.) (South African Veterinary Association, 2009)The objectives of this study were to compare the efficacy of 6 different dry-cow intramammary antimicrobial products for the treatment and prevention of mastitis during the dry period in a well-managed high producing ...
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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; 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 ...
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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 ...
Now showing items 1-7 of 7