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Notes: Estimates of Genetic Parameters for Deer Browsing of Douglas-fir

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This report evaluates genetic variation in wintertime deer browsing among full-sib families of Douglas-fir. Cuttings of 10-year-old progeny of a mating of six trees as females crossed with 11 trees as males provided estimates of heritability, combining ability, and genetic gain in browsing resistance. Open-pollinated progeny and cuttings from parent trees were also included in the study. An average of 46 percent of the cuttings were browsed after 38 days exposure. Browsing among seedling families ranged from 39 to 69 percent. Sixty-five percent of the total genetic variation was additive. Reciprocal, maternal, and specific combining ability components were nonsignificant. Family heritability was estimated at 0.73. Gain per generation, based on selecting 10 percent of the most resistant families, was estimated at 11 percent. Forest Sci. 32:178-184.

Keywords: Pseudotsuga menziesii; animal damage; resistance; selection

Document Type: Miscellaneous

Affiliations: Statistical Mathematician, USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, Forestry Sciences Laboratory, Corvallis, Oregon

Publication date: March 1, 1986

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