Use pedigree information, with weights to calculate within herd EBVs 4. Mate bulls and heifers as yearlings 5. Do options 2 through 5. In most species, selection of males is much more important than selection of females. Individual males typically contribute much more than do individuals females, so selection of males is critical.
Males have advantages in accuracy of selection and selection intensity.
To increase more must use genetic prediction technologies. A linear combination of phenotypic information and weighting factors used for genetic prediction. Each item of phenotypic information is usually expressed as a deviation from contemporary group mean. Table 11.1 lists coefficients for common single-source indexes. An increase in similarity of performance of family members caused by their sharing a common environment.