... considered, and the modelfor the underlying variable is :1Above, s; and 2 s! are the random effects of sire i and maternal grandsire j,2 frespectively. Under additive ... grandsire model. This can be written as :where Y¡jk is an observation on individual k, with sire i and maternal grandsire j. Thescalars s; and 2 1 s, are the random ... random effects of sires and maternal grandsires, respectively, and (3 is a vector of fixed effects, which relate to Y¡jk via the incidence vector xii,. Inpractical applications,...