Paper presented at the IUFRO symposium “Intensive Forestry: The Role of Eucalypts”, held in Durban, South Africa, in September 1991

Genetic Gains from Different Kinds of Breeding Population and Seed or Plant Production Population

Published in: South African Forestry Journal
Volume 160, issue 1, 1992 , pages: 49–65
DOI: 10.1080/00382167.1992.9630411
Author(s): C., J.A. Shelbourne, New Zealand

Abstract

Genetic gains from between- and within-family selection were predicted for a trait of low (0,1) medium (0,2) and high (0,4) narrow-sense heritability, under five different breeding-population options and for 12 plant-production population options. The breeding populations (BP) included open-pollinated (OP), control-pollinated (full-sib) and cloned open-pollinated BP; and the production populations included four different open-pollinated seedling and six clonal orchards, as well as two schemes of selecting clones for clonal forestry. Selection intensities (selection ratios) were chosen throughout to be practical and realistic. It was assumed that between-family selection ratios in the BP would be very low (two out of three families) to minimise reduction of effective population size.

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