Relationship between mastitis pathogen numbers in bulk tank milk and bovine udder infections in California dairy herds.

R. N. Gonzalez, D. E. Jasper, R. B. Bushnell, T. B. Farver

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Samples of bulk tank milk and cow-composite milk from 23,138 dairy cows from 50 California dairies were examined by use of microbiologic procedures. The number of colonies of mastitis pathogens isolated per milliliter of bulk tank milk (used as a predictor of the percentage of infected cows in the herd) was evaluated, using simple regression analysis and Spearman's rank correlation. Correlations between the pathogens and the percentage of cows in each herd shedding the pathogens were found for Streptococcus agalactiae (r = 0.71) and mycoplasma (r = 0.59), but were considerably lower for other pathogens. When greater than or equal to 4,000 colonies of Streptococcus agalactiae were found per milliliter of bulk tank milk, at least 7% of the cows in the herd was shedding this organism. However, a pattern was not found between the number of mycoplasma colonies per milliliter of bulk tank milk and the percentage of infected cows in the herd.

Original languageEnglish (US)
Pages (from-to)442-445
Number of pages4
JournalJournal of the American Veterinary Medical Association
Volume189
Issue number4
StatePublished - Aug 15 1986

ASJC Scopus subject areas

  • veterinary(all)

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