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    • Journal of Range Management, Volume 49 (1996)
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    Effects of Flourensia cernua ingestion on nitrogen balance of sheep consuming tobosa

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    Author
    King, D. W.
    Frederickson, E. L.
    Estell, R. E.
    Havstad, K. M.
    Wallace, J. D.
    Murray, L. W.
    Issue Date
    1996-07-01
    Keywords
    pleuraphis mutica
    cholesterol
    blood chemistry
    digestible protein
    nitrogen retention
    urea
    alfalfa
    nitrogen balance
    weed palatability
    leaves
    Flourensia
    body weight
    sheep
    grasses
    New Mexico
    dry matter
    feed intake
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    Citation
    King, D. W., Frederickson, E. L., Estell, R. E., Havstad, K. M., Wallace, J. D., & Murray, L. W. (1996). Effects of Flourensia cernua ingestion on nitrogen balance of sheep consuming tobosa. Journal of Range Management, 49(4), 331-335.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644240
    DOI
    10.2307/4002592
    Additional Links
    https://rangelands.org/
    Abstract
    Flourensia cernua DC. (tarbush) is a deciduous shrub with potential as a high-protein forage source for livestock. Twenty-four Polypay X Rambouillet wethers housed in metabolism crabs were used to evaluate tarbush as a N source for sheep fed a low quality grass diet. Treatments were 100% ground tobosa grass (Pleuraphis mutica BuckL) or tobosa substituted with 10, 20, or 30% whole pre-bloom tarbush leaves (n = 5) or 26% ground alfalfa (n = 4, Medicago sativa L.) on a dry matter basis (dmb). Sheep were fed ad libitum for 11 days, after which feed was restricted to 1% (dmb) of body weight for 11 days to reduce sorting and maintain uniform intake. Apparent dry matter digestibility was not improved (P = 0.2646) with tarbush or alfalfa. Fecal N was similar (P = 0.1626), but urinary N varied (P = 0.0008) among treatments. Apparent N digestibility differed (P = 0.0042) among treatments (43, 46, 50, 56, and 63% for sheep consuming 0,10, 20, or 30% tarbush or alfalfa, respectively). All treatments resulted in similar (P = 0.1569) but negative N retentions (-2.4, -2.2, -2.8, -2.0, and -1.5 g day-1 for sheep consuming 0, 10, 20, or 30% tarbush or alfalfa, respectively). Serum clinical profiles (day 22) confirmed all sheep were nutritionally stressed, but did not indicate toxicosis. Although neither tarbush nor alfalfa N compensated for the low quality basal diet, N from 30% tarbush was utilized with similar efficiency to alfalfa N. The major impediment for using tarbush as a N source appeared to be low palatability.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002592
    Scopus Count
    Collections
    Journal of Range Management, Volume 49, Number 4 (July 1996)

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