Abstract
SYNOPSIS Multiple trait index selection (MTIS) is a combination of quantitative genetics and multivariate regression. The estimation of the expected additive value of an individual, for one trait, can be obtained through the heritability of that trait. The calculation of an index consista of independent steps: (1) the estimation of the additive values through multivariate linear regression on the phenotypic values of the individuals and (2) the linear combination of these estimates using economic weights. The problems associated with index calculation are briefly discussed. Selection experiments in pig breeding show little evidence that the theory works well.
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