Clinical mastitis in two California dairy herds participating in contagious mastitis control programs.

R. N. Gonzalez, D. E. Jasper, N. C. Kronlund, Thomas B Farver, James S Cullor, R. B. Bushnell, J. D. Dellinger

Research output: Contribution to journalArticle

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Abstract

The occurrence of clinical mastitis in two large California dairy herds over a 3-yr period is described. Herds had been participating for 15 or 22 yr in mastitis control programs against Streptococcus agalactiae and Staphylococcus aureus, had low bulk tank SCC, and had maintained good standards of hygiene and husbandry, but clinical mastitis remained a serious problem. A total of 1654 clinical mastitis cases were detected; the annual incidence in each herd was 49%. Coliform bacteria and environmental streptococci were etiological agents in 60% of the total clinical mastitis cases; coliforms produced 1.6 times more clinical mastitis than environmental streptococci. A higher susceptibility to clinical mastitis, primarily from coliform bacteria and environmental streptococci, was found in the first months of lactation. Clinical mastitis incidence peaked for cows in lactations 4 and 5 and was lowest during the first lactation. Highest incidence of clinical mastitis due to coliform bacteria and environmental streptococci at each dairy occurred during the rainy season (late fall and winter).

Original languageEnglish (US)
Pages (from-to)648-660
Number of pages13
JournalJournal of Dairy Science
Volume73
Issue number3
StatePublished - Mar 1990

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Mastitis
dairy herds
mastitis
Streptococcus
coliform bacteria
Lactation
lactation
Bacteria
incidence
Incidence
herds
Streptococcus agalactiae
milk tanks
etiological agents
Hygiene
hygiene
Staphylococcus aureus
dairies
wet season
cows

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Gonzalez, R. N., Jasper, D. E., Kronlund, N. C., Farver, T. B., Cullor, J. S., Bushnell, R. B., & Dellinger, J. D. (1990). Clinical mastitis in two California dairy herds participating in contagious mastitis control programs. Journal of Dairy Science, 73(3), 648-660.

Clinical mastitis in two California dairy herds participating in contagious mastitis control programs. / Gonzalez, R. N.; Jasper, D. E.; Kronlund, N. C.; Farver, Thomas B; Cullor, James S; Bushnell, R. B.; Dellinger, J. D.

In: Journal of Dairy Science, Vol. 73, No. 3, 03.1990, p. 648-660.

Research output: Contribution to journalArticle

Gonzalez, RN, Jasper, DE, Kronlund, NC, Farver, TB, Cullor, JS, Bushnell, RB & Dellinger, JD 1990, 'Clinical mastitis in two California dairy herds participating in contagious mastitis control programs.', Journal of Dairy Science, vol. 73, no. 3, pp. 648-660.
Gonzalez, R. N. ; Jasper, D. E. ; Kronlund, N. C. ; Farver, Thomas B ; Cullor, James S ; Bushnell, R. B. ; Dellinger, J. D. / Clinical mastitis in two California dairy herds participating in contagious mastitis control programs. In: Journal of Dairy Science. 1990 ; Vol. 73, No. 3. pp. 648-660.
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