Abstract
• This article reviews the theoretical basis for indirect selection — where early selection is an example — and how correlated response is calculated. • The review is followed by a description of issues as to the choice of selection criteria that could explain the lack of substantial progress on breeding for wood quality. These include: the autoregressive nature of selection criteria, overemphasizing the importance of basic density as selection criterion, ignoring age-related trends of wood properties, using rotation age rather than technical thresholds as objective traits and ignoring that not all grades have identical marginal economic value. • Three data sets are either analyzed for the first time or reanalyzed under different assumptions, to explore the importance of these criticisms. • Finally, the use of critical value thresholds as very early selection criteria is suggested and discussed in the context of improving intrinsic corewood quality.
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