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| |Mastitis causing bacteria
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| Contagious mastitis
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| # - primary source: udders of infected cows,
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| # - is spread to other cows primarily at milking time,
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| # - results in high bulk tank SCC.
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| It is caused by:
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| # Streptococcus agalactiae (> 40% of all infections),
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| # Staphylococcus aureus (30 - 40% of all infections).
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| The S. aureus bacterium is hardly eradicable, but can be reduced to less than 5% of the cows in a herd. The S. agalactiae is fully eradicable from a herd.
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| Environmental mastitis
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| # Primary source: the environment of the cow.
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| # High rate of clinical mastitis (especially the lower resistant cows, e.g. Early lactation).
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| # Individual scc is not necessarily high (less than 300,000 is possible) .
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| It is caused by:
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| # environmental steptococci (5 - 10% of all infections).
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| * Streptococcus uberis.
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| * Streptococcus bovis.
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| * Streptococcus dysgalactiae.
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| * Enterococcus faecium.
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| * Enterococcus faecalis.
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| # - Coliforms (< 1% of all infections):
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| * Escherichia coli.
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| * Klebsiella pneumoniae.
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| * Klebsiella oxytoca.
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| |}
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Revision as of 16:20, 8 March 2024
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