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    • Journal of Range Management, Volume 47 (1994)
    • Journal of Range Management, Volume 47, Number 6 (November 1994)
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    Comparison of sheep and goat preferences for leafy spurge

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    Author
    Walker, J. W.
    Kronberg, S. L.
    Al-Rowaily, S. L.
    West, N. E.
    Issue Date
    1994-11-01
    Keywords
    Balsamorhiza sagittata
    Balsamorhiza
    biological control
    Euphorbia esula
    Agropyron cristatum
    Idaho
    sheep
    goats
    grazing behavior
    feeding preferences
    
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    Citation
    Walker, J. W., Kronberg, S. L., Al-Rowaily, S. L., & West, N. E. (1994). Comparison of sheep and goat preferences for leafy spurge. Journal of Range Management, 47(6), 429-434.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644374
    DOI
    10.2307/4002992
    Additional Links
    https://rangelands.org/
    Abstract
    The objective of these studies was to compare preference for leafy spurge (Euphorbia esula L.) by sheep and goats. Study 1 was a choice test that paired leafy spurge with either arrowleaf balsamroot (Balsamorhiza sagittata (Pursh) Nutt.) or crested wheatgrass (Agropyron cristatum (L.)Gaertn.) for a 30 minute feeding period. Study 2 consisted of 3 grazing trials on spurge-infested pastures. Differences between sheep and goat grazing were measured using capacitance meter estimates of standing crop and ocular estimates of composition; counts of grazed and ungrazed leafy spurge stems; and bite counts to estimate botanical composition of diets. The paired choice study showed that selection for leafy spurge was affected by the interaction (P < 0.0001) of animal species and the choice alternative. Goats preferred leafy spurge (80% of consumption) compared to arrowleaf balsamroot, but demonstrated a relative avoidance (33% of consumption) of leafy spurge when paired with crested wheatgrass. Sheep always avoided leafy spurge compared to the alternative forage and consumed an average of only 28% of their intake from leafy spurge during the 30 minute test. In the grazing trials goats took 64% of their bites from leafy spurge compared to 20% for sheep. This represented a relative preference for spurge by goats compared to a strong relative avoidance by sheep. Sheep avoided areas in the pasture that had high densities of flowering spurge stems while goats were relatively unresponsive to stem densities. Goat grazing reduced the number of flowering stems. Stem numbers were 90 vs. 23 flowering stems m2 (P = .04) in sheep- and goat-grazed pastures, respectively. Goats appear to have a greater potential for biological control of leafy spurge than sheep. This advantage may be particularly important in areas where leafy spurge is relatively unpalatable, which the present study site represented.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002992
    Scopus Count
    Collections
    Journal of Range Management, Volume 47, Number 6 (November 1994)

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