Palatability of Douglasfir Foliage to Mule Deer in Relation to Chemical and Spatial Factors
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CitationTucker, R. E., Majak, W., Parkinson, P. D., & McLean, A. (1976). Palatability of douglasfir foliage to mule deer in relation to chemical and spatial factors. Journal of Range Management, 29(6), 486-489.
PublisherSociety for Range Management
JournalJournal of Range Management
AbstractRelative preference of Douglasfir needles from eight environmental conditions was determined in a feeding trial with penned tame deer of mixed age and sex. Relative preference (percent fresh weight ingested) varied between 0 and 74%, with significant differences between open (16%) and gully (9%) sites, between old (20%) and young (4%) trees, and between tops (16%) and bottoms (8%) of trees. Shading was found to be responsible for some difference in palatability, unshaded being preferred (22%) over shaded needles (4%). Relative preference was found to be correlated with moisture content (r = -0.57). Relative preference was also found to be correlated with chlorogenic acid (r = 0.41), a naturally occurring phenolic ester which was quantified by fluorometric scanning after being observed in a thin layer chromatography (TLC) screening experiment. Crude protein was not significantly correlated with preference.