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    Free-choice grazing of native range and cool-season grasses

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    Author
    Karn, J. F.
    Ries, R. E.
    Issue Date
    2002-09-01
    Keywords
    native ranges
    Bromus inermis
    Agropyron desertorum
    protein content
    liveweight gain
    fiber content
    chemical composition
    pastures
    Pascopyrum smithii
    in vitro digestibility
    botanical composition
    grazing
    beef cattle
    feeding preferences
    North Dakota
    animal behavior
    crested wheatgrass
    western wheatgrass
    smooth bromegrass
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    Citation
    Karn, J. F., & Ries, R. E. (2002). Free-choice grazing of native range and cool-season grasses. Journal of Range Management, 55(5), 469-473.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643685
    DOI
    10.2307/4003224
    10.2458/azu_jrm_v55i5_karn
    Additional Links
    https://rangelands.org/
    Abstract
    A grazing system which allows cattle to select a season-long diet more nearly meeting their nutrient requirements should facilitate optimal weight gains. A study was conducted near Mandan, N. D. comparing season-long weight gains of yearling steers free-choice grazing on composite pastures containing equal sized plots of 'Nordan' crested wheatgrass (Agropyron desertorum) (Fisch. Ex. Link) Schult.), 'Rodan' western wheatgrass (Pascopyrum smithii (Rydb.) Löve), 'Lincoln' smooth bromegrass (Bromus inermis Leyss.), and native range, to pastures containing the individual pasture types alone. The study was initiated in mid-May and terminated in early October each year from 1995-1997. Pastures were grazed at a stocking rate of 1.9 ha per steer for 147 days or 1.7 AUM ha(-1). Steer behavior on composite pastures was recorded every 10 min. from dawn to dusk 2 days per week each summer. In 1997, forage samples were clipped for chemical analysis at 4-week intervals from all pasture types either within composite pastures or as individual pasture types. Only in 1996 were daily gains of steers on the free-choice treatment different (P < 0.10) from all other treatments. Over the 3-year study, daily gains for steers on the free-choice treatment (1.11 kg) were statistically equal to steers on smooth bromegrass (1.04 kg) and western wheatgrass (1.00 kg) and were significantly greater than daily gains on native range (0.98 kg) and crested wheatgrass (0.97 kg). Steers tended to spend a greater percentage of observation time grazing smooth bromegrass than the other 3 pasture types, especially early in the grazing season. The period of maximum grazing preference for the other pasture types was late in the season in 1995 and 1996 for crested wheatgrass, in mid-season in 1996 for native range, and late in the season in 1997 for western wheatgrass. Chemical analysis of forage samples collected in 1997 show that smooth bromegrass had the highest crude protein and in vitro dry matter digestibility, and the lowest neutral detergent fiber at all 3 summer grazing periods. Forage quality data and the preference of steers for smooth bromegrass help to explain why steers on this treatment had excellent daily gains, especially during early and mid-season.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003224
    Scopus Count
    Collections
    Journal of Range Management, Volume 55, Number 5 (September 2002)

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