ABSTRACT
In this chapter, the methods required to develop and apply selection indices to plant breeding programs are reviewed and the required calculations are outlined by using simulated data. In order to demonstrate the necessary calculations, data from the genotypic and phenotypic distributions of three correlated traits were simulated by using program MNORN. Indices can be used to enhance single trait selection for different populations and selection schemes. They may be used to select among partially inbred lines within a cross in a self-pollinated crop, or for mass selection among individuals in a cross-pollinated crop. And they may be used to enhance response to selection for a single trait among families of a particular type. Falconer described the merits of weighting data from different families and individuals when selecting within populations in which there is some type of family structure.
