Bovis ISSN 2398-2993

Summer mastitis (Farmer Factsheet)

Contributor(s): XLVets, Vetstream Ltd , Tom Greenham

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  • Summer mastitis is also known as August bag.
  • It occurs mostly in summer, although in spring calving herds it may be more common earlier in the year.
  • It is thought to be spread by flies, although other environmental risks may also be involved.
  • It is most often seen in dry cows and heifers, but young calves may also be affected.
  • It is a bacterial infection of the dry udder, usually with the bacterium Trueperella pyogenes, although other bacteria may also be involved.
  • Very few affected quarters will recover, so treatment is aimed at preventing the cow from becoming sick, rather than saving the quarter.
  • The main goal should be to minimize the chance of the disease occurring.
  • The economic impact of this condition can be significant as it often results in non-functional quarters and may lead to the cow becoming sick, aborting her calf or even dying from spread of bacteria in to the blood stream.

Clinical signs

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Cause

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Treatment

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Prevention

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