There is some empirical evidence that animals differ genetically not only in mean, but also in environmental (or residual) variance. The aim was to investigate prediction of breeding values and responses to selection in mean and residual variance with genetic heterogeneity of residual variance in a situation with mass selection. Using multiple regression as in a selection index, breeding values for mean and residual variance were predicted with little bias by regressions on linear, quadratic and cubic terms of the phenotypic deviation. After one round of mass selection, phenotypic variance changed between -6% and +25%. Changes in variance were largest with intense selection. The existence of genetic heterogeneity of residual variance offers opportunities to breed for more uniformity.

H. A Mulder, William G Hill

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 26.03, 2006
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