Table 1 An example of OSGS for ten unlinked markers segregating among inbred lines derived from the F2 cross of an elite and exotic parent. At each marker, elite and exotic homozygotes are respectively coded -1 and +1. Negative regression coefficient indicates the increasing allele for the trait is carried by the elite parent and a positive coefficient that the increasing allele is carried by the exotic parent. Here, seven favorable alleles originate from the elite and three from the exotic parent. For each individual (ID1-5), the sum of the products of marker genotypes and regression coefficients gives an estimate of the total breeding value, Embedded Image. Totalling products over the first three and last seven markers partitions the breeding value into contribution respectively from the elite (Embedded Image) and exotic (Embedded Image) parent. For the coefficients given, the expected correlation between Embedded Image and Embedded Imageis 0.89 and between Embedded Image and Embedded Image is 0.45. The expected correlation between Embedded Image is zero, since the markers are not linked in this example
MarkerFavored alleleRegression coefficientMarker genotypes
ID1ID2ID3ID4ID5
M1Elite−0.95−111−11
M2Elite−0.34−1−11−1−1
M3Elite−0.47−11−1−11
M4Elite−0.11−1−1−1−11
M5Elite−0.4911−1−11
M6Elite−0.631−1−111
M7Elite−1.24−1−111−1
M8Exotic0.221111−1
M9Exotic0.38−1−111−1
M10Exotic0.82111−11
Total breeding value (Embedded Image)2.651.070.590.27−0.85
Elite contribution (Embedded Image)1.990.41−0.830.49−1.07
Exotic contribution (Embedded Image)0.660.661.42−0.220.22