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    • Journal of Range Management, Volume 51 (1998)
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    Grazing intensities, vegetation, and heifer gains: 55 years on shortgrass

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    Author
    Hart, R. H.
    Ashby, M. M.
    Issue Date
    1998-07-01
    Keywords
    long term experiments
    ground cover
    liveweight gain
    stocking rate
    heifers
    sustainability
    grazing intensity
    biomass
    plant litter
    botanical composition
    Colorado
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    Citation
    Hart, R. H., & Ashby, M. M. (1998). Grazing intensities, vegetation, and heifer gains: 55 years on shortgrass. Journal of Range Management, 51(4), 392-398.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644109
    DOI
    10.2307/4003323
    Additional Links
    https://rangelands.org/
    Abstract
    Shortgrass rangeland, dominated by blue grama (Bouteloua gracilis [H.B.K.] Lag. ex Steud), was grazed at 3 intensities, equivalent to mean stocking rates of 16.7, 23.0, and 36.5 heifer-days ha-1, from 1939 through 1994. Few changes in plant communities had been documented by the early 1970's. In 1992-1994, frequency of occurrence, basal and foliar cover, and biomass at peak standing crop (PSC) were determined on the remaining pasture at each grazing intensity, and on 3 ungrazed exclosures. Blue grama and buffalograss (Buchloe dactyloides [Nutt.] Engelm.) increased, and western wheatgrass (Pascopyrum smithii [Rydb.] A. Love) and needle-and-thread (Stipa comata Trin. &Rupr.) decreased, as grazing intensity increased. Redthree-awn (Aristida longiseta Steud.) was most plentiful under light grazing. Basal cover and biomass of forbs were lower under grazing than in exclosures, but differences in biomass were not significant. Shrubs and half-shrubs decreased as grazing intensity increased. Frequency and cover of plains pricklypear (Opuntia polyacantha Haw.) were higher in the exclosures and under light grazing than under moderate or heavy grazing; biomass was 4 to 6 times as high in the exclosures as under any grazing intensity. Heifer gains declined linearly with increasing grazing pressure index. Optimum (most profitable) stocking rate was about 20% higher than that under the moderate grazing intensity, under which biomass production was maintained and shrub and pricklypear remained at low levels. Returns to land, labor, and management were only slightly higher under the optimum stocking rate than under the moderate grazing intensity. The moderate grazing intensity appears to be both profitable and sustainable.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003323
    Scopus Count
    Collections
    Journal of Range Management, Volume 51, Number 4 (July 1998)

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