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Realized genetic gain for 2nd year height in jack pine


Realized genetic gain for 2nd year height in jack pine



Canadian Journal of Forest Research 19(6): 707-714



ISSN/ISBN: 0045-5067

DOI: 10.1139/x89-110

A complete cycle of within-family selection for 2nd-year height in jack pine (Pinus banksiana Lamb.) was accomplished. The expected absolute gain from a theoretical population is 9.3%. The expected gain calculated using actual selected parental group means was 6.5% for upper selection and -6.5% for lower selection; realized gains were 5.1% for upper selection and -3.7% for lower selection. Reasons for reductions in the realized gain compared with expected gain include (i) a finite base population size; (ii) biological constraints such as inconsistent seed production; (iii) non-normal distribution for the trait of interest; and (iv) nonselected male parents in open pollination.

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Accession: 007724448

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