A new selection index percent emphasis method using subindex weights and genetic evaluation accuracy

The current international standard methodology to quantify trait percent emphasis in selection indexes is based on a simple multiplication of the relative contribution each trait's economic value (converted absolute value) and its genetic deviation. This method does not reflect actual applied when index used practice. effort traits differ considerably their accuracy evaluation, no account taken for either favorable or antagonistic correlations among traits. A new adjusted by both correlation proposed. Genetically highly correlated are grouped into subindexes applying hierarchical clustering matrix. Then subindex calculated within group, with weighting included accuracy. Finally, converted full according conventional corresponding subgroup. can also be sets breeding values weights. When New Zealand sheep where distinct across groups, shrank low-heritability traits, including survival, from 51% 19%; expanded that growth 30% 49%, better reflecting pressure reality. were similar, became difficult. Accounting affected traits' within-subindex group rankings, whereas all subgroup equally. differences describing gives more practical indication likely outcome selecting index. defining made significant difference only subset case study examples.