Impact of milking characteristics and morphology of udder and teats on clinical mastitis in first- and second-lactation Norwegian cattle

Trond Slettbakk, Asbjørn Jørstad, Thomas B Farver, John C. Holmes

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Data from the Norwegian progeny testing program were used to examine the impact of milking characteristics and morphology of udder and teats on clinical mastitis in first- and second-lactation Norwegian cattle. The study was designed as a 1-1 matched case-control study with herd, parity, days in lactation and calving season as matching variables. Conditional maximum likelihood logistic regression was used to evaluate the effects of three primary (2 min milk, milk leakage and teat-end-to-floor distance) and six other study variables. Treatment records from the Norwegian health card system on acute and chronic clinical mastitis were used to define cases. The chosen model included 565 matched pairs. Significant risk factors of clinical mastitis were decreasing teat-end-to-floor distance (P = 0.02) and periparturient udder edema (P < 0.01). Borderline effects were demonstrated by larger than herd-average teat diameter (P = 0.04), udder asymmetry (P = 0.05) and increasing 2 min milk (P = 0.08). Results were compared to a previous study on the same data with loge somatic cell count as the dependent variable. Inclusion of teat-end-to-floor distance in the genetic improvement scheme may increase the efficiency of genetic selection for mastitis resistance.

Original languageEnglish (US)
Pages (from-to)235-244
Number of pages10
JournalPreventive Veterinary Medicine
Volume24
Issue number4
DOIs
StatePublished - 1995

Keywords

  • Cattle
  • Mastitis

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Food Animals

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