Index selection

Index Selection is a method of artificial selection in which several useful traits are selected simultaneously. First, each trait that is going to be selected is assigned a weight - the importance of the trait. I.e., if you were selecting for both height and the coat darkness in dogs, if height were the more important of the two one would assign that a higher weighting. For instance, height's weighting could be ten and coat darkness could be one. This weighting value is then multiplied by the observed value in each individual animal and then the score for each of the characteristics is summed for each individual. This result is the index score and can be used to compare the worth of each organism being selected. Therefore, only those with the highest index score are selected for breeding via artificial selection.