J Vet Sci.  2012 Mar;13(1):103-105. 10.4142/jvs.2012.13.1.103.

Prevalence and antibiotic resistance of mastitis pathogens isolated from dairy herds transitioning to organic management

Affiliations
  • 1Department of Microbiology, College of Veterinary Medicine and BK21 Program for Veterinary Science, Seoul National University, Seoul 151-742, Korea. yhp@snu.ac.kr
  • 2Department of Veterinary Clinical Science, Washington State University, Pullman, WA 99164, USA. fox@vetmed.wsu.edu
  • 3Department of Animal Sciences, Washington State University, Pullman, WA 99164, USA.
  • 4Animal, Plant and Fisheries Quarantine and Inspection Agency, Anyang 430-824, Korea.

Abstract

Changes in udder health and antibiotic resistance of mastitis pathogens isolated from dairies upon conversion from conventional to organic management over a 3-year period was studied. Coagulase-negative staphylococci (CNS) were the most prevalent mastitis pathogens isolated. CNS were significantly less resistant to beta-lactam antibiotics when isolated from milk after the herd transitioned to organic management. Cessation of the use of antimicrobial therapies in dairies in combination with organic management could lead to a reduction in the antimicrobial resistance of mastitis pathogens.

Keyword

antibiotic resistance; mastitis pathogens; organic dairy

MeSH Terms

Ampicillin/pharmacology
Animals
Anti-Bacterial Agents/pharmacology
Cattle
Cephalothin/pharmacology
Cloxacillin/pharmacology
Drug Resistance, Microbial
Female
Lactation
Mastitis, Bovine/*microbiology
Microbial Sensitivity Tests
Organic Agriculture
Penicillins/pharmacology
Prevalence
Staphylococcal Infections/microbiology/*veterinary
Staphylococcus/*drug effects/*isolation & purification

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