Mastitis in cows is inflammation of the udder. infection is caused by many types of bacteria: streptococcus spp., staphylococcus spp., klebsiella spp., etc. mastitis develops when a quarter is contaminated from the outside environment, where pathogens enter the teat canal. mastitis may be also caused by bruising and trauma to the udder if the udder has been bumped and bruised. the damaged tissue creates ideal conditions for an infection to develop even if theres no break in the skin for pathogens to enter from. also, if a cow has an infection elsewhere in her body and bacteria and white blood cells and such are circulating through her bloodstream, they may start to multiply and create a serious infection in the bruised mammary tissue. mastitis is more common in dairy cows because of two things: more quantity and complexity of mammary tissue, and a larger udder is more easily bruised than a small one typical of beef cows. beef cows may also become susceptible to mastitis especially when her calf is weaned, and there is no calf to releave the pressure in her udder for several days. if the cow is active during this time, bruising is more likely to develop in the full, tight and sore udder.
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