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    • Journal of Range Management, Volume 38 (1985)
    • Journal of Range Management, Volume 38, Number 1 (January 1985)
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    Cattle Grazing Blue Grama Rangeland. II. Seasonal Forage Intake and Digesta Kinetics

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    Author
    McCollum, F. T.
    Galyean, M. L.
    Issue Date
    1985-11-01
    Keywords
    nutrients
    digestion
    digesta
    Bouteloua gracilis
    seasonal variation
    rangelands
    grazing
    New Mexico
    beef cattle
    forage
    feed intake
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    Citation
    McCollum, F. T., & Galyean, M. L. (1985). Cattle grazing blue grama rangeland II. Seasonal forage intake and digesta kinetics. Journal of Range Management, 38(6), 543-546.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/645445
    DOI
    10.2307/3899749
    Additional Links
    https://rangelands.org/
    Abstract
    Four field trials were conducted from early August to late October, 1982, on blue grama (Bouteloua gracilis) rangeland in south-central New Mexico, to examine relationships among grazing season, forage intake and digestive function in beef steers (Bos taurus). Organic matter intake declined from 24.0 g/kg body weight (BW) in early August to 17.4 g/kg BW in late September and then increased to 20.9 g/kg BW in the early dormant season (late October). From early growing season to early dormancy, diet digestibility and passage rates decreased while retention time of digesta in the rumen increased. Rate and extent of in vitro organic matter disappearance were 66.5, 6.7; 63.1, 6.7; 51.6, 4.8; and 47.9%, 5.6%/hour in early August, late August, late September and late October, respectively. Fluid and particulate passage rates (%/hour) were 24.9, 4.6; 12.7, 3.9; 11.1, 3.7; and 10.5, 3.5, respectively, for the same periods. Retention of particulate digesta varied from 26.1 hours in the early growing season to 34.3 hours in early dormancy. Gastrointestinal fill gradually increased as season progressed. Results suggest that maintenance of a diverse plant community, containing not only desirable grasses but also palatable forbs, may allow cattle to maintain a higher level of nutrient intake during periods of grass dormancy.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3899749
    Scopus Count
    Collections
    Journal of Range Management, Volume 38, Number 1 (January 1985)

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