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    • Journal of Range Management, Volume 51 (1998)
    • Journal of Range Management, Volume 51, Number 5 (September 1998)
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    Spring defoliation effects on bluebunch wheatgrass: I. Winter forage quality

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    Author
    Clark, P. E.
    Krueger, W. C.
    Bryant, L. D.
    Thomas, D. R.
    Issue Date
    1998-09-01
    Keywords
    energy requirements
    developmental stages
    Pseudoroegneria spicata
    stubble
    protein content
    yields
    Cervus elaphus
    winter
    cutting
    digestibility
    crude protein
    phenology
    nutritive value
    forage
    dry matter
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    Citation
    Clark, P. E., Krueger, W. C., Bryant, L. D., & Thomas, D. R. (1998). Spring defoliation effects on bluebunch wheatgrass: I. Winter forage quality. Journal of Range Management, 51(5), 519-525.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644025
    DOI
    10.2307/4003368
    Additional Links
    https://rangelands.org/
    Abstract
    The winter forage quality of bluebunch wheatgrass (Agropyron spicatum [Pursh] Scribn. &Smith) is generally inadequate for maintenance of wintering Rocky Mountain elk (Cervus elaphus nelsoni Bailey). Previous attempts to improve the winter forage quality of bluebunch wheatgrass by clipping and livestock grazing have achieved mixed results. We report crude protein (CP), (in vitro dry matter digestibility (IVDMD), and dry matter (DM) yield responses of bluebunch wheatgrass to 3 phenological stage/defoliation intensity treatment combinations. The study was conducted in 1993 and 1994 at 2 sites in the Blue Mountains of northeastern Oregon. Bluebunch wheatgrass was hand clipped 1 to a 7.6-cm stubble height in early June under 1 of 3 treatment combinations: 1) mid-boot/whole-plant clipped, 2) mid-boot/one-half of the plant's basal area clipped, and 3) inflorescence emergence/whole-plant clipped. Early November levels of CP and IVDMD were greater under all 3 treatments compared to an unclipped control. Mean forage quality improvement over the control was greatest in the inflorescence emergence treatment with an improvement of 1.3 percentage points for CP and 5.8 percentage points for IVDMD. Dry matter yield of the control exceeded that of all clipping treatments. Increases in forage quality resulting from forage conditioning treatments may be important to the viability of elk populations wintering on rangelands where forage quality, rather than quantity, is limiting.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003368
    Scopus Count
    Collections
    Journal of Range Management, Volume 51, Number 5 (September 1998)

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