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  • Title: Microbiological results from milk samples obtained premilking and postmilking for the diagnosis of bovine intramammary infections.
    Author: Sears PM, Wilson DJ, Gonzalez RN, Hancock DD.
    Journal: J Dairy Sci; 1991 Dec; 74(12):4183-8. PubMed ID: 1787189.
    Abstract:
    Bacteriological culture results were compared between 336 pairs of quarter milk samples collected premilking and postmilking. Using a positive result on either premilking or postmilking samples as the definitive diagnosis, premilking sampling sensitivity was 91% for Staphylococcus aureus, 91% for coagulase-negative staphylococci, and 97% for Streptococcus other than agalactiae. Postmilking sampling sensitivities were 81, 45, and 58%, respectively, for the same pathogens. Requiring both premilking and postmilking samples for the definitive diagnosis, specificities were 92, 86, and 95% for premilking sampling alone and 96, 98, and 99% for postmilking sampling alone. Such differences in specificity would result in major differences in predictive value of a positive culture for herds with a low prevalence. Multiple isolates were significantly more common from premilking samples.
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