Estimation of Genetic Parameters for Somatic Cell Score in Holsteins

Y. Da, M. Grossman, I. Misztal, G. R. Wiggans

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Genetic parameters of somatic cell scores for Holstein cows were estimated using an animal model and REML for two data sets. Set 1, with 13,017 records from 5278 cows, was used to obtain variance components, heritability, and repeatability for two lactation measures: the simple average and the weighted average of test day data. Set 2, with 14,418 records from 4806 cows, was used to obtain genetic correlations for the simple average between lactations 1 and 2, between lactations l and 3, and between lactations 2 and 3. Simple and weighted average of test day somatic cell scores had the same heritabilities (.12) and repeatabilities (.35). Phenotypic variances were about 1.2, and herd-sire interaction variances were small (.002). Genetic correlation for somatic cell score was about .55 between lactations 1 and 2 and between lactations l and 3 and .65 between lactations 2 and 3. Phenotypic correlation was .20 between lactations 1 and 2, .16 between lactations 1 and 3, and .31 between lactations 2 and 3.

Original languageEnglish (US)
Pages (from-to)2265-2271
Number of pages7
JournalJournal of Dairy Science
Volume75
Issue number8
DOIs
StatePublished - 1992

Keywords

  • Holsteins
  • SA
  • SCS
  • WA
  • genetic parameters
  • simple average of SCS for test day data
  • somatic cell score
  • somatic cell scores
  • variance components
  • weighted average of SCS for test day data

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