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Table 5 Variancesa of random group- (\({\upsigma }_{{\text{g}}}^{2}\)), litter- (\({\upsigma }_{{\text{l}}}^{2}\)), and residual (\({\upsigma }_{{\text{e}}}^{2}\)) effects, phenotypic (\({\upsigma }_{{\text{P}}}^{2}\)) and total genetic variance (\({\upsigma }_{{{\text{TGE}}}}^{2}\)), and direct heritability (\({\text{h}}^{2}\)) for average daily gain (g/day) in Landrace (\({\text{L}}\)), Yorkshire (\({\text{Y}}\)), and crossbreds (\({\text{YL}}\))

From: Selection for social genetic effects in purebreds increases growth in crossbreds

Population \({{\varvec{\upsigma}}}_{{\mathbf{g}}}^{2}\) \({{\varvec{\upsigma}}}_{{\mathbf{l}}}^{2}\) \({{\varvec{\upsigma}}}_{{\mathbf{e}}}^{2}\) \({{\varvec{\upsigma}}}_{{\mathbf{P}}}^{2}\) \({{\varvec{\upsigma}}}_{{{\mathbf{TGE}}}}^{2}\) \({\mathbf{h}}^{2}\) \({{\varvec{\upsigma}}}_{{{\mathbf{TGE}},{\mathbf{k}} - {\mathbf{YL}}}}^{2}\) a
\({\text{L}}\) 777 (33) 654 (29) 6373 (72) 10,588 (93) 3167 (336) 0.25 (0.01) 5408 (785)
\({\text{Y}}\) 939 (33) 539 (24) 6977 (68) 11,780 (97) 3972 (403) 0.27 (0.01) 4508 (799)
  1. Standard errors are shown in brackets
  2. a\({\upsigma }_{{{\text{TGE}},{\text{k}} - {\text{YL}}}}^{2}\) is the total genetic variance available for selection in the purebreds to obtain genetic response in the crossbreds, YL, where \(k = \left\{ {L,Y} \right\}\)