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Selection Efficiency in a Nonselected Population of Loblolly Pine

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Estimated selection-age efficiencies (present values of estimated correlated response) for family and within-family selection, based on both the additive and total genetic component for tree height of loblolly pine (Pinus taeda L.) at age 26, are reported for a study established near Bainbridge, Georgia, during 1963, 1964, and 1965. When correlated response was discounted at the rate of 8% per year, optimum selection ages for full-sib families, based on total genetic and on additive components alone, were 7 and 10 yr, respectively. Optimum selection ages were 6 and 7 yr for simultaneous selection of family and within-family for full-sib and half-sib families respectively, when based on the total genetic component. The optimum selection age for family plus within-family selection based on the additive component alone was 10 yr for both full-sib and half-sib families. Where production systems capture all, or part, of the nonadditive genetic variation, selection can be made 3 to 4 yr earlier than where systems capitalize only on additive genetic variance. Mass-controlled or supplemental pollination, "bulking-up" full-sib families by means of vegetative propagation, and vegetatively propagating selected individual genotypes, promise both greater genetic gains and earlier realization of those gains. For. Sci. 40(3):452-473.

Keywords: Pinus taeda; correlated responses; selection age; tree improvement

Document Type: Journal Article

Affiliations: Project Leader, Tree Improvement International Paper Company, Southlands Exp. Forest, Bainbridge, GA

Publication date: August 1, 1994

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