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Deer Browsing of Douglas-fir Trees in Relation to Volatile Terpene Composition and in vitro Fermentability

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The compositions of the volatile terpenes in steam-distilled oils from new growth and year-old needles of browsed and unbrowsed Douglas-fir trees were compared by gas chromatographic analysis. Levels of specific compounds did not differ significantly between browsed and unbrowsed trees in the young growth at bud burst, but differences appeared as the young growth matured. The browsed trees were significantly higher in α-pinene, -pinene, cis-ocimene, fenchyl alcohol, α-terpineol, and an unidentified sesquiterpene and lower in sabinene, α-terpinene, terpinolene, -terpinene, terpinen-4-ol, and α-humulene at one or more sampling times than unbrowsed trees. None of these differences were statistically significant in a smaller sample of trees 3 years later. Browsed trees had higher levels of microbial promoters and lower levels of inhibitors of rumen fermentation processes than the unbrowsed trees, but they did not differ in in vitro fermentability by deer rumen microbes, nor in nitrogen, crude fiber, crude fat, total sugar, sucrose, or moisture content. Significant variations among pairs of trees (sites) were noted for a few terpene components, in vitro fermentability, and crude fat. Although terpene concentrations in browsed and unbrowsed trees showed considerable variation, the levels of the terpenes that promoted rumen microbial fermentation averaged higher in browsed than unbrowsed trees while those which inhibited fermentation averaged lower. However, overall in vitro fermentability of browsed and unbrowsed trees did not differ significantly. Forest Sci. 26:179-193.
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Keywords: Pseudotsuga menziesii; animal damage; browse selection

Document Type: Journal Article

Affiliations: Associate Professor, Food Science and Technology, University of California, Davis

Publication date: 1980-06-01

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    Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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