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Marker-assisted selection for commercial crossbred performance.

J C M Dekkers1

  • 1Department of Animal Science and Center for Integrated Animal Genomics, Iowa State University, Ames 50011-3150, USA. jdekkers@iastate.edu

Journal of Animal Science
|May 17, 2007
PubMed
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Marker-assisted selection (MAS) improves crossbred performance (CC) in pigs by using marker effects on CC performance. This method increases response rates and reduces inbreeding compared to traditional selection methods.

Area of Science:

  • Animal Breeding and Genetics
  • Quantitative Genetics
  • Genomic Selection

Background:

  • Low genetic correlations between purebred and commercial crossbred (CC) performance limit purebred selection effectiveness.
  • Combined crossbred and purebred selection (CCPS) improves selection but increases inbreeding and data recording demands.

Purpose of the Study:

  • To evaluate marker-assisted selection (MAS) for improving CC performance by overcoming limitations of purebred selection and CCPS.
  • To develop a model for incorporating marker information into selection strategies using selection index theory.

Main Methods:

  • Developed a model based on selection index theory to predict response and inbreeding rates for marker-assisted selection (MAS).
  • Simulated a terminal sire line pig breeding program with 60 CC half-sibs per purebred candidate.

Related Experiment Videos

  • Assessed MAS with varying accuracies of marker-based estimated breeding values (EBVs).

    • Main Results:

    • CC-MAS significantly increased CC performance response rates and reduced inbreeding compared to purebred selection and CCPS.
    • With 0.6 accuracy EBVs, CC-MAS yielded 34% and 10% greater responses than purebred selection and CCPS, respectively.
    • With 0.9 accuracy EBVs, CC-MAS yielded 75% and 43% greater responses, while reducing inbreeding rates.

    Conclusions:

    • Marker-assisted selection (MAS) using estimates of marker effects on CC performance effectively enhances crossbred performance.
    • CC-MAS overcomes the need for extensive pedigree recording and reduces inbreeding rates.
    • This approach offers a more efficient strategy for genetic improvement in commercial crossbred populations.