TABLE 3

Percentage of significant QTL estimates for individual sires, and averages of absolute values of QTL estimates and true chromosome substitution effects of significant results under the linked polygenic model

Genetic variance on marked chromosome (% of σ2)Percentage of sires with significant QTL estimatesaAverage absolute value for sires with significanta,b QTL estimates (genetic standard deviation units)
QTL estimateTrue chromosome substitution effectTrue marker bracket substitution effect
P < 0.05P < 0.01P < 0.05P < 0.01P < 0.05P < 0.01P < 0.05P < 0.01
Heritability = 0.25
3.36.31.41.0041.2460.1700.1880.0700.074
13.312.13.11.0441.2800.4220.4980.1540.164
33.317.57.51.1181.3420.7420.8800.2540.276
Heritability = 0.70
3.39.02.60.5800.7110.2060.2380.0750.080
13.320.49.50.6430.7700.4730.5620.1610.176
33.335.722.60.7420.8620.7270.8400.2490.268
  • a For null hypothesis of zero chromosome substitution effect for sire.

  • b Thresholds for significant sire QTL estimates at P < 0.05 and P < 0.01 are 0.83 and 1.10 genetic standard deviation units for heritability = 0.25 and equal to 0.47 and 0.62 genetic standard deviation units for heritability = 0.70.