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Research-Article| Volume 68, ISSUE 6, P1531-1553, June 1985

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Environmental Mastitis: Cause, Prevalence, Prevention1,2

  • Author Footnotes
    3 Department of Dairy Science.
    ,
    Author Footnotes
    4 Food Animal Health Research Program.
    K.Larry Smith
    Footnotes
    3 Department of Dairy Science.
    4 Food Animal Health Research Program.
    Affiliations
    Departments of Dairy Science and Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Wooster 44691
    Search for articles by this author
  • Author Footnotes
    3 Department of Dairy Science.
    D.A. Todhunter
    Footnotes
    3 Department of Dairy Science.
    Affiliations
    Departments of Dairy Science and Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Wooster 44691
    Search for articles by this author
  • Author Footnotes
    3 Department of Dairy Science.
    P.S. Schoenberger
    Footnotes
    3 Department of Dairy Science.
    Affiliations
    Departments of Dairy Science and Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Wooster 44691
    Search for articles by this author
  • Author Footnotes
    1 Salaries and research support provided by state and federal funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University. Journal Article No. 101:84.
    2 This material is based upon work supported by US Department of Agriculture under Agreement No. 59-2392-0-2-081-0, No. 82-CSRS-2-1071, and No. 83-CSRS-2-2276.
    3 Department of Dairy Science.
    4 Food Animal Health Research Program.
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      Abstract

      Rate of intramammary infection by coliform bacteria and species of streptococci other than Streptococcus agalactiae (environmental pathogens) was studied in a dairy herd in total confinement. Rate was higher during the dry period than during lactation and increased progressively as parity increased. Rate was maximal during summer and coincided with maximum exposure to coliforms in bedding. Streptococcal infections were longer than coliform. Approximately 59% of streptococcal infections and 69% of coliform infections were present for 30 lactation days or less. Percent quarters infected by day of year varied between .7 and 3.0% for coliform bacteria and between 1.6 and 4.7% for streptococci. Approximately 81% of coliform infections and 53% of streptococcal infections during lactation were clinical. Clinical cases were highest during the first 76 days of lactation and during summer. Only 6.7% of coliform infections resulted in acute coliform mastitis, and all acute cases were during summer or early lactation. Dry cow therapy reduced rate of streptococcal infection during the early dry period but was without effect during the prepartum period. There was no effect of dry cow therapy on coliform infection rate during the dry period. Problems associated with prevalence and control of environmental mastitis were discussed.

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