In this model, each individual may have more than one genetic group effect in its ancestry, and these effects are modeled as the summation of the product of the group effect (gk) times the additive genetic relationship between individual k and the ancestral group j over j = 1 to n groups. Then, for the mixed model, we introduce a matrix, Q, which corresponds to an additive relationship matrix between individuals and the ancestral groups, and the mixed model equation (MME) takes the following form (Mrode, 2014; Quaas and Pollak, 1981).