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Identity-by-descent genomic selection (IBD-GS) improves genetic gain for binary traits, especially when the desired trait is less common. This method offers a significant advantage over traditional pedigree-based selection.

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Area of Science:

  • Animal breeding and genetics
  • Quantitative genetics
  • Genomics

Background:

  • Genomic selection (GS) enables breeding value estimation in non-phenotyped individuals.
  • Identity-by-descent genomic selection (IBD-GS) is a cost-effective GS approach using sparse marker linkage analysis.

Purpose of the Study:

  • To evaluate the efficacy of IBD-GS for binary traits using selective genotyping strategies.
  • To compare IBD-GS with traditional pedigree-based selection.

Main Methods:

  • Simulated binary traits with varying heritability and incidences in an aquaculture-like population.
  • Employed selective genotyping on the top 30% of families based on phenotype.
  • Utilized three distinct genotyping strategies for training sibs.

Main Results:

  • IBD-GS significantly increased genetic gain compared to pedigree-based selection, particularly for traits with 10-50% incidence (over 20% relative increase).
  • The advantage of IBD-GS grew with trait heritability.
  • Selective genotyping of sibs with the least common phenotype yielded the most improvement.
  • IBD-GS showed diminishing returns at higher incidences (80-90%).

Conclusions:

  • IBD-GS with sparse, selective genotyping is effective for binary trait genetic evaluation.
  • Substantial genetic gain increases were observed compared to pedigree-based selection.
  • Targeting the minor phenotype category during selective genotyping maximized gains.
  • IBD-GS demonstrated a greater advantage over traditional methods at low to moderate trait incidences.