Factors Affecting Extra Responsefrom MAS

• Effects of identified QTL (% of genetic variance)

• Recombination rates

• Effectiveness of Phenotypic Selection
  • Accuracy of BLUP EBV
    • Heritability
    • Restrictions on phenotyping (trait measurement)
      • in one sex only (sex-limited traits)
      • late in life (after selection)
      • not on live animal (carcass traits)
      • difficult to measure (disease traits)

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