Climatic effects on occurrence of clinical mastitis.

D. Morse, M. A. DeLorenzo, C. J. Wilcox, Robert J Collier, R. P. Natzke, D. R. Bray

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Clinical mastitis records for 6.5 yr from a large north Florida dairy and corresponding daily weather data were analyzed. Monthly incidence of clinical mastitis was expressed as percent of cow-days in milk and graphed against monthly average daily maximum temperature humidity index values and monthly total rainfall. No trends were evident with rainfall. In 3 of 6 yr, monthly incidence of clinical mastitis increased more than 50% above annual incidence, and this followed high monthly temperature-humidity values. Least squares was used to estimate regression coefficients of temperature-humidity index categories based on 999,969 Holstein records. A temperature humidity index category represented the number of days used to calculate average daily maximum temperature-humidity index value. Sources of variation in observed occurrence of clinical mastitis were cow, parity, month, year, interaction of parity by month, and continuous effects of temperature-humidity index categories 2, 6, 15, 30, 60, each to third order and 60 by parity interaction. In all temperature-humidity index categories as the temperature-humidity index value increased, occurrence of clinical mastitis increased. When values rose from 55 to 80, twice as many for 2 d cows showed signs of clinical mastitis.

Original languageEnglish (US)
Pages (from-to)848-853
Number of pages6
JournalJournal of Dairy Science
Volume71
Issue number3
StatePublished - Mar 1988
Externally publishedYes

Fingerprint

Mastitis
Humidity
mastitis
humidity
Temperature
temperature
Parity
cows
incidence
Incidence
rain
Weather
Least-Squares Analysis
meteorological data
least squares
dairies
Milk
Rosa
Holstein
milk

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Food Science
  • veterinary(all)

Cite this

Morse, D., DeLorenzo, M. A., Wilcox, C. J., Collier, R. J., Natzke, R. P., & Bray, D. R. (1988). Climatic effects on occurrence of clinical mastitis. Journal of Dairy Science, 71(3), 848-853.

Climatic effects on occurrence of clinical mastitis. / Morse, D.; DeLorenzo, M. A.; Wilcox, C. J.; Collier, Robert J; Natzke, R. P.; Bray, D. R.

In: Journal of Dairy Science, Vol. 71, No. 3, 03.1988, p. 848-853.

Research output: Contribution to journalArticle

Morse, D, DeLorenzo, MA, Wilcox, CJ, Collier, RJ, Natzke, RP & Bray, DR 1988, 'Climatic effects on occurrence of clinical mastitis.', Journal of Dairy Science, vol. 71, no. 3, pp. 848-853.
Morse D, DeLorenzo MA, Wilcox CJ, Collier RJ, Natzke RP, Bray DR. Climatic effects on occurrence of clinical mastitis. Journal of Dairy Science. 1988 Mar;71(3):848-853.
Morse, D. ; DeLorenzo, M. A. ; Wilcox, C. J. ; Collier, Robert J ; Natzke, R. P. ; Bray, D. R. / Climatic effects on occurrence of clinical mastitis. In: Journal of Dairy Science. 1988 ; Vol. 71, No. 3. pp. 848-853.
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