Noting the mean phenotype in parental, selected parents and the progeny by E(Z0), E Z W) and E(Z1), we can define the selection differential S = E(Z w) − E(Z0) and the response R = E(Z1) − E(Z0).
In the IBD-GS scheme parents were solely selected based on EBV, which is expected to give more even long-term genetic contributions of the selected parents compared to a classical selection scheme imposing selection of genetically inferior parents.
Based on the selection criteria, only 50% of the selected parents were truly heterozygous for the QTL while the remaining were falsely assumed to be heterozygous, and consequently the estimate of was about 50% of the true values.
The fact that parental training was only offered to selected parents at one of the units may appear to be an expression of the management still not seeing its full value.
However, even if the parental generation follows a normal distribution, the selected parents do not (equation 7) and the use of parent-offspring regression poses even more of a problem than the direct method.
Despite no restrictions on the number of families to be used, the IBD-GS model selected parents from nearly all the 30 pre-selected families (Table 2), and inbreeding levels were similar for the two models (not shown).> -wrap-foot>> -wrap-foot> *From base population generation 5000 (base population in the statistical analyses).
If the benefit of this new (genome-wide marker) information is evaluated using the base PEV reliability, its usefulness in a breeding program may be undervalued, particularly when compared to the value of old information from the parental generation, i.e., the EBV of selected parents [ 16].
Similar to selective breeding in agriculture, it consists of the crossing of two carefully selected parents possessing an interesting phenotype.
During the 20th century planned hybridization between carefully selected parents has become dominant in the breeding of self-pollinated species.
This number divides selected parents into two parts.
New offspring is produced by joining genes of selected parents.
