Diameter-Length,-Weight Relations for Blackbrush [Coleogyne ramosissima] Branches

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Abstract
Regression was used to relate branch diameter to branch length (r = 0.85) and weight (r2 = 0.94) for blackbrush plants in southwestern Utah [USA]. These regression equations were subsequently used to estimate blackbrush utilization by domestic goats in a browsing study. The diameter-length equation compared favorably with before-and-after measurements for accuracy and greatly reduced man-hour costs in determining utilization. Estimates of utilization based on the diameter-weight equation were less than estimates based on the before-and-after approach or diameter-length equation; the diameter-weight equation accounted for leaves and thus provided a more accurate estimate of utilization.

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