Prevalence of udder infections and mastitis in 50 California dairy herds.

R. N. González, D. E. Jasper, Thomas B Farver, R. B. Bushnell, C. E. Franti

Research output: Contribution to journalArticle

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Abstract

The California mastitis test (CMT) and bacteriologic culture were performed on samples of bulk-tank milk and cow-composite milk (n = 23,138 cows) from 50 California dairies, 19 of the 50 with known mastitis problems. Thirty-eight (76.0%) bulk-tank milk samples and 12,334 (53.3%) cows were positive by results of the CMT. Potential mastitis agents were isolated from 5,085 (22%) cows. Staphylococcus aureus was isolated from all 50 herds, Streptococcus agalactiae was isolated from 47 herds, and Mycoplasma sp was isolated from 24 herds. For cow-composite milk samples, the prevalences were 9.3% for Str agalactiae, 9.1% for S aureus, 0.9% for Mycoplasma sp, 1.2% for coliform bacteria, 0.9% for other streptococci, 0.8% for coagulase-negative staphylococci, and 1.3% for other organisms. The relative sensitivity and the relative specificity of the CMT performed on cow-composite milk samples were 83.4% and 55.2%, respectively, and the predictive value of positive CMT results was 34.2%.

Original languageEnglish (US)
Pages (from-to)323-328
Number of pages6
JournalJournal of the American Veterinary Medical Association
Volume193
Issue number3
StatePublished - Aug 1 1988

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Animal Mammary Glands
Mastitis
udders
dairy herds
mastitis
Milk
cows
milk
Infection
infection
milk tanks
Mycoplasma
herds
sampling
Streptococcus agalactiae
coliform bacteria
coagulase negative staphylococci
Coagulase
Streptococcus
Staphylococcus

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Prevalence of udder infections and mastitis in 50 California dairy herds. / González, R. N.; Jasper, D. E.; Farver, Thomas B; Bushnell, R. B.; Franti, C. E.

In: Journal of the American Veterinary Medical Association, Vol. 193, No. 3, 01.08.1988, p. 323-328.

Research output: Contribution to journalArticle

González, RN, Jasper, DE, Farver, TB, Bushnell, RB & Franti, CE 1988, 'Prevalence of udder infections and mastitis in 50 California dairy herds.', Journal of the American Veterinary Medical Association, vol. 193, no. 3, pp. 323-328.
González, R. N. ; Jasper, D. E. ; Farver, Thomas B ; Bushnell, R. B. ; Franti, C. E. / Prevalence of udder infections and mastitis in 50 California dairy herds. In: Journal of the American Veterinary Medical Association. 1988 ; Vol. 193, No. 3. pp. 323-328.
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