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Alternative somatic cell count traits as mastitis indicators for genetic selection.

Y de Haas1, W Ouweltjes, J ten Napel

  • 1NRS, Animal Evaluation Unit, PO Box 454, NL-6800 AL Arnhem, the Netherlands. Haas.Y@nrs.nl

Journal of Dairy Science
|May 20, 2008
PubMed
Summary

This study explored alternative somatic cell count (SCC) traits to reduce genetic susceptibility to mastitis. Findings suggest combining various SCC measures can improve udder health more effectively than single SCC measurements.

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Area of Science:

  • Animal Genetics
  • Dairy Science
  • Veterinary Epidemiology

Background:

  • Mastitis, a significant dairy cattle disease, incurs substantial economic losses.
  • Clinical mastitis (CM) and subclinical mastitis (SCM) are major concerns in dairy herds.
  • Genetic susceptibility to mastitis can be reduced by selecting for alternative traits.

Purpose of the Study:

  • To identify alternative somatic cell count (SCC) traits for decreasing genetic susceptibility to mastitis.
  • To evaluate lactation-average SCC, SCC proportion above 150,000 cells/mL, and SCC peak patterns.
  • To estimate genetic parameters and correlations between SCC traits and mastitis.

Main Methods:

  • Utilized two large datasets (A and B) comprising thousands of lactations from multiple herds.

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  • Estimated variance components for sire and permanent animal effects.
  • Calculated genetic parameters, heritabilities, and genetic correlations between SCC traits and mastitis outcomes.

    • Main Results:

    • Heritabilities for SCC traits varied from 0.01 to 0.13, while mastitis traits had heritabilities around 0.03.
    • High genetic correlations (0.55-0.98) were observed between SCC traits and both CM and SCM.
    • Specific SCC traits showed strong genetic links with CM and SCM, with some providing additional information beyond lactation-average SCC.

    Conclusions:

    • Alternative SCC traits offer valuable information for genetic selection against mastitis.
    • Combining various SCC measures can enhance overall udder health improvement strategies.
    • Further research into these alternative traits can optimize mastitis resistance breeding programs.