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The variance of the random genetic effects for the pairwise analyses involving WSI and litter traits (WSI-NBA, WSI-LBW, WSI-NPW, and WSI-LWW) was equal to [A x V.sub.d,sd] where A = additive relationship matrix among animals in the pedigree file (boars and sows) and [V.sub.d,sd] = 3 x 3 matrix of variances and covariances among additive direct sow effects for trait 1, 1/2 additive direct genetic boar effects for trait 2, and 1/2 additive direct+maternal sow genetic effects for trait 2, where trait 1 = WSI, and trait 2 = NBA, LBW, NPW, or LWW.
The variance of the genetic random effects for the pairwise analyses involving litter traits (NBA-LBW, NBA-NPW, NBA-LWW, LBW-NPW, LBW-LWW, and NPW-LWW) was equal to [A x V.sub.sd,sd] where A = additive relationship matrix among animals in the pedigree file (boars and sows) and [V.sub.sd,sd] = 4x4 matrix of variances and covariances among 1/2 additive direct genetic boar effects for trait 1, 1/2 additive direct genetic boar effects for trait 2, 1/2 additive direct+maternal sow genetic effects for trait 1, and 1/2 additive direct+maternal sow genetic effects for trait 2.
The first block contained variances and covariances between 1/2 additive direct genetic boar effects for traits 1 and 2.