Table 4.
ssGBLUP performance, with different preselection types and intensities, all with a heritability of 0.1
| Measure | Type and intensity of preselection | ||||||
|---|---|---|---|---|---|---|---|
| No preselection | High GPS | Very high GPS | High PAPS | Very high PAPS | High RPS | Very high RPS | |
| Preselection accuracya | Not applicable | 0.71 (0.69–0.73) | 0.71 (0.69–0.73) | 0.44 (0.42–0.46) | 0.44 (0.42–0.46) | 0.00 (0.00–0.00) | 0.00 (0.00–0.00) |
| Subsequent selection accuracyb | 0.80 (0.78–0.82) | 0.48 (0.44–0.52) | 0.48 (0.44–0.52) | 0.69 (0.67–0.71) | 0.68 (0.66–0.70) | 0.73 (0.71–0.75) | 0.73 (0.73–0.73) |
| Absolute biasc | 0.01 (−0.01–0.03) | 0.03 (0.01–0.05) | 0.03 (0.01–0.05) | 0.03 (0.01–0.05) | 0.04 (0.02–0.06) | 0.05 (0.01–0.09) | 0.05 (0.01–0.09) |
| Dispersion biasd | 1.02 (1.00–1.04) | 1.01 (0.95–1.07) | 1.00 (0.94–1.06) | 1.01 (0.99–1.03) | 1.01 (0.97–1.05) | 1.01 (0.97–1.05) | 1.02 (0.98–1.06) |
| True realized genetic gaine | 1.38 (1.32–1.44) | 1.26 (1.18–1.34) | 1.24 (1.16–1.32) | 1.11 (1.03–1.19) | 1.00 (0.92–1.08) | 0.58 (0.54–0.62) | 0.39 (0.37–0.41) |
| Estimated realized genetic gainf | 1.36 (1.30–1.42) | 1.28 (1.22–1.34) | 1.26 (1.20–1.32) | 1.12 (1.06–1.18) | 1.01 (0.95–1.07) | 0.58 (0.56–0.60) | 0.37 (0.35–0.39) |
Results shown only for the selection candidates in the most recent generation (i.e. generation 15), and the results are means over 10 replicates (and 95% confidence intervals)
Types of preselection: GPS genomic preselection; PAPS parent average preselection; RPS random preselection
Intensities of preselection: No preselection; high preselection - 10% of the male and 15% of the female selection candidates preselected; very high preselection - 5% of the male and 12.5% of the female selection candidates preselected
aCorrelation between true and genomic estimated breeding values of all the selection candidates
bCorrelation between true and genomic estimated breeding values of the preselected animals
cDifference between average true breeding value and average genomic estimated breeding value of preselected animals, expressed in additive genetic standard deviation
dCoefficient of regression of true on genomic estimated breeding values of the preselected animals
eDifference between average true breeding value of subsequently selected animals and average true breeding value of their parents, expressed in additive genetic standard deviation
fDifference between average genomic estimated breeding value of the subsequently selected animals and average genomic estimated breeding value of their parents, expressed in additive genetic standard deviation