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Growth Responses of Environmental Mastitis Pathogens to Long-Chain Fatty Acids¹

The Ohio State University, Ohio Agricultural Research and Development Center, Wooster 44691

ABSTRACT

Streptococcus uberis, Streptococcus faecalis, Escherichia coli, and Klebsiella pneumoniae were tested for susceptibility to long-chain fatty acids predominant in teat canal keratin. Antibacterial activity of free fatty acids on each bacterial species was measured after 12 h in synthetic media. Growth responses of all three strains of Streptococcus uberis were completely inhibited by C_18:3 and those of two of three strains by C_18:2 at 1 µg/ml. None of the fatty acids tested were bactericidal to Streptococcus faecalis. Saturated fatty acids C₁₄ and C₁₆ were more bacteriostatic to Streptococcus faecalis than were polyene fatty acids. Growth responses of coliform species were not affected by long-chain fatty acids. In general, environmental mastitis pathogens were resistant to fatty acids predominant in teat canal keratin.

¹ Salaries and research support provided by State and Federal Funds appropriated to The Ohio State University, Ohio Agricultural Research and Development Center. Journal Article Number 89-87.

² Department of Dairy Science.

³ Food Animal Health Research Program.