Genetic parameters for major milk proteins in Dutch Holstein-Friesians

G.C.B. Schopen, J.M.L. Heck, H. Bovenhuis, M.H.P.W. Visker, H.J.F. van Valenberg, J.A.M. van Arendonk

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Abstract

The objective of this study was to estimate genetic parameters for major milk proteins. One morning milk sample was collected from 1,940 first-parity Holstein-Friesian cows in February or March 2005. Each sample was analyzed with capillary zone electrophoresis to determine the relative concentrations of the 6 major milk proteins. The results show that there is considerable genetic variation in milk protein composition. The intraherd heritabilities for the relative protein concentrations were high and ranged from 0.25 for ß-casein to 0.80 for ß-lactoglobulin. The intraherd heritability for the summed whey fractions (0.71) was higher than that for the summed casein fractions (0.41). Further, there was relatively more variation in the summed whey fraction (coefficient of variation was 11% and standard deviation was 1.23) compared with the summed casein fraction (coefficient of variation was 2% and standard deviation was 1.72). For the caseins and -lactalbumin, the proportion of phenotypic variation explained by herd was approximately 14%. For ß-lactoglobulin, the proportion of phenotypic variation explained by herd was considerably lower (5%). Eighty percent of the genetic correlations among the relative contributions of the major milk proteins were between ¿0.38 and +0.45. The genetic correlations suggest that it is possible to change the relative proportion of caseins in milk. Strong negative genetic correlations were found for ß-lactoglobulin with the summed casein fractions (¿0.76), and for ß-lactoglobulin with casein index (¿0.98). This study suggests that there are opportunities to change the milk protein composition in the cow¿s milk using selective breeding
Original languageEnglish
Pages (from-to)1182-1191
JournalJournal of Dairy Science
Volume92
Issue number3
DOIs
Publication statusPublished - 2009

Keywords

  • capillary-zone-electrophoresis
  • production traits
  • bovine-milk
  • dairy-cows
  • phenotypic correlations
  • coagulation properties
  • beta-lactoglobulin
  • urea nitrogen
  • fatty-acids
  • casein

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