Analysis of Bulk Tank Milk to Determine the Bacterial Flora of the Mammary Gland of Lactating Cows in a Dairy Herd

Authors

  • R. J. Farnsworgh Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota 55108
  • D. W. Johnson Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota 55108
  • J. F. Anderson Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota 55108
  • Margaret Wheelock Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota 55108
  • A. J. Johnson Seymour, WI

DOI:

https://doi.org/10.21423/bovine-vol1977no12p112-114

Keywords:

bacterial count, bacteriology, flora, milk, milk hygiene, milk quality

Abstract

Milk samples (5-10 ml) were collected from bulk tanks from 5 dairy herds on 5 consecutive days. Samples were stored frozen and composite samples prepared for each herd for measurement of total bacterial counts. Streptococcus agalactiae, streptococci other than S. agalactiae, pathogenic staphylococci, non-pathogenic staphylococci and coliforms using blood agar, TKT-ferric citrate, tellurite glycine and MacConkey media. Plates were incubated at 37 deg C for 18-24 h, and counts made on plates with 30-300 colonies present. Details of analyses of milk from the 5 herds are given and the results discussed in terms of milk and detection of major pathogens present. The method is recommended for herd evaluation and as an indication of further tests that need to be made.

Cover image of the 12th Volume of the Bovine Practitioner: a photo of two women standing in front of the the Old Courthouse which is framed by the St. Louis Arch. The journal title and AABP logo are placed in the upper righthand corner and the 10th annual conference information at the bottom.

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Published

1977-11-01

How to Cite

Farnsworgh, R. J., Johnson, D. W., Anderson, J. F., Wheelock, M., & Johnson, A. J. (1977). Analysis of Bulk Tank Milk to Determine the Bacterial Flora of the Mammary Gland of Lactating Cows in a Dairy Herd. The Bovine Practitioner, 1977(12), 112–114. https://doi.org/10.21423/bovine-vol1977no12p112-114

Issue

No. 12 (1977 November)

Section

Articles