Milk culture results in a large Norwegian survey--effects of season, parity, days in milk, resistance, and clustering

Journal of Dairy Science
O OsteråsO Reksen

Abstract

A nationwide random computerized assignment survey that included 3,538 sets of 4 quarter milk samples from 2,834 dairy cows was conducted during 2000. Every fifth cow from every 50th herd was randomly selected for sampling and culture during each quarter of the year. Milk culture results of pathogens known to be related to mastitis were recorded regardless of whether mastitis had been indicated by any inflammatory measure or not. Farmers were blinded to all test results to minimize any potential interventions that might be prompted by the results. The most prevalent isolate was Staphylococcus aureus, which was identified in 8.2% of the quarter milk samples. More than 15 colony-forming units/0.01 mL of Staph. aureus were found in 4.3% of the quarter milk samples, whereas 3.5% had only 1 to 3 colony-forming units/0.01 mL. Streptococcus dysgalactiae, coagulase-negative staphylococci (CNS), and Streptococcus uberis were isolated from 1.2, 3.3, and 0.4% of quarter milk samples, respectively. No isolates were found in 76.6% of the quarter milk samples tested. Among individual cows, 22.2% had an isolate of Staph. aureus in > or = 1 quarter. Only Strep. dysgalactiae exhibited a higher prevalence with increased parity. Prevalence of Sta...Continue Reading

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Citations

Apr 13, 2007·Journal of Clinical Microbiology·A PitkäläM T Koskinen
Jun 9, 2011·Acta Veterinaria Scandinavica·Ylva PerssonUlrika Grönlund-Andersson
Feb 9, 2011·Acta Veterinaria Scandinavica·Piret KalmusKalle Kask
Nov 28, 2012·Acta Veterinaria Scandinavica·Arzu Funda BagcigilSatu Pyörälä
May 28, 2013·The Veterinary Quarterly·Herman W BarkemaRuth N Zadoks
Jun 30, 2015·The Journal of Dairy Research·Maiara G BlagitzAlice M M P Della Libera
Jul 8, 2017·Critical Reviews in Food Science and Nutrition·Qianting OuZhenjiang Yao
Aug 25, 2012·Journal of Dairy Science·O ReksenY H Schukken
Nov 28, 2017·Journal of Dairy Science·A-K NymanK Persson Waller
May 23, 2016·Journal of Dairy Science·Heidi HiitiöSuvi Taponen
Mar 21, 2007·Journal of Dairy Science·R G M Olde RiekerinkH Stryhn
Jan 20, 2007·Journal of Dairy Science·A M SogstadA O Refsdal
Nov 21, 2007·Journal of Dairy Science·J D FergusonG Licitra
Sep 21, 2007·Journal of Dairy Science·O ReksenO Østerås
Jan 1, 2009·Irish Veterinary Journal·O Osterås, L Sølverød
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Jun 27, 2018·The Onderstepoort Journal of Veterinary Research·David BlignautInge-Marié Petzer

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