Definition of the selection index in generations , , , DH, , for different selection strategies for developing introgression populations.

Selection for complete donor chromosomes (C), selection for donor chromosome halves (H) and selection for donor target segments (S) were combined to form different selection strategies (left column). , and denote the donor genome proportions of the chromosome on which the target segment is located, of the chromosome half on which the target segment is located and of the target segment itself. , and correspond to , , and denote the recipient genome proportion outside the respective chromosome region.