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Related Experiment Videos

Associations between casein haplotypes and milk yield traits

S Lien1, L Gomez-Raya, T Steine

  • 1Department of Animal Science, Agricultural University, As, Norway.

Journal of Dairy Science
|September 1, 1995
PubMed
Summary

Norwegian Cattle casein haplotype 5 is linked to increased protein and milk yield. This suggests a quantitative trait locus near casein genes influencing protein production in dairy cows.

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Area of Science:

  • Animal Genetics
  • Dairy Science
  • Quantitative Genetics

Background:

  • Casein polymorphisms are important genetic markers in dairy cattle.
  • Understanding genetic associations can improve breeding programs for milk and protein yield.

Purpose of the Study:

  • To investigate associations between casein haplotypes and milk, protein, and fat yields in Norwegian Cattle.
  • To identify potential quantitative trait loci (QTL) affecting economically important dairy traits.

Main Methods:

  • Genotyping of 13 sires and 250 sons for casein polymorphisms, identifying 10 haplotypes.
  • Utilizing a granddaughter design to analyze associations between haplotypes and yield traits.
  • Performing independent analyses for specific haplotypes (1, 5, 10) and a pooled analysis (T), with a confirmatory analysis (5N).

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Main Results:

  • No significant associations were found between casein haplotypes and milk yield in analyses 1, 10, and T.
  • A significant association was detected for haplotype 5 with increased protein and milk yield in analysis 5.
  • Haplotype 5 showed an increase in protein yield ranging from 2.52 to 14.58 kg.

Conclusions:

  • The results suggest the presence of a QTL in the casein gene region affecting protein yield in Norwegian Cattle.
  • Haplotype 5 is a potential marker for enhanced protein production in this dairy population.
  • Further research is warranted to pinpoint the specific QTL and its mechanism.