Genetic Parameters for Somatic Cells, Protein, and Fat in Milk of Holsteins

M. M. Schutz, L. B. Hansen, G. R. Steuernagel, J. K. Reneau, A. L. Kuck

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Lactation records of milk, fat, and protein yields; fat and protein percentages; and two measures of somatic cells were examined and estimates of variance components were obtained. Heritabilities from multiple-trait REML for 1st parity were .16, .16, .13, .38, .48, .05, and .10, respectively, for milk, fat yield, protein yield, fat percentage, protein percentage, SCC, and somatic cell score. In each parity, heritability was lower for protein yield than for fat yield but higher for protein percentage than for fat percentage. Genetically, somatic cells and yields had positive correlations in 1st parity but smaller or negative correlations in 2nd and 3rd and later parities. Phenotypic correlations of somatic cells and yield were negative. For each parity, genetic and phenotypic correlations with somatic cells were higher for protein percentage than for fat percentage.

Original languageEnglish (US)
Pages (from-to)494-502
Number of pages9
JournalJournal of Dairy Science
Volume73
Issue number2
DOIs
StatePublished - 1990

Keywords

  • genetic parameters
  • protein
  • somatic cells

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