Feeding preference and its relation to herbivore repellent studies

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Abstract
Two testing procedures were used to evaluate the effectiveness of gaseous selenium compounds emitted from a packaged solid as black-tailed deer (Odocoileushemionuscolumbianus Richardson) browsing repellents: (i) pen bioassay trials with simultaneous access to all treatments, and (ii) tests with controlled access to only one treatment at a time. The two testing procedures yielded different results. Bioassay trials indicated that there was a significant difference (p = 0.049) in the browsing damage that occurred between treated and untreated seedlings. There was no difference (p = 0.444) in the browsing damage, however, when all seedlings in the enclosure were identically treated. The dependence of the results on the experimental design used and the implications of using measures of herbivore preference to test potential browse repellents are discussed.

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