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    • Journal of Range Management, Volume 51 (1998)
    • Journal of Range Management, Volume 51, Number 4 (July 1998)
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    Herbage characteristics and performance of steers grazing old world bluestem

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    Author
    Coleman, S. W.
    Forbes, T. D. A.
    Issue Date
    1998-07-01
    Keywords
    sown grasslands
    liveweight gain
    Bothriochloa ischaemum
    Bothriochloa bladhii
    body weight
    rain
    stocking rate
    Oklahoma
    steers
    biomass
    plant height
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    Citation
    Coleman, S. W., & Forbes, T. D. A. (1998). Herbage characteristics and performance of steers grazing old world bluestem. Journal of Range Management, 51(4), 399-407.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644115
    DOI
    10.2307/4003324
    Additional Links
    https://rangelands.org/
    Abstract
    Old World bluestem (OWB; Bothriocloa spp.) are popular in the southern Great Plains but little is known about the relationships between forage characteristics and animal productivity. The influence of differences in herbage mass and sward height of OWB on rate of gain during the summer grazing season was examined during 2 years at El Reno, Okla. Soils were fine, silty Pachic Haplustolls of the Dale series. Swards of caucasian [B. caucasica (Trin.) C. E. Hubb.] and 'Plains' [B. ischaemum var ischaemum (L.) Keng.] OWB were maintained at different levels of forage mass (low, medium, and high) by continuous variable stocking and were grazed from mid- May to late September by steers with an initial weight of about 225 kg. Weight gains were depressed in late August, but in 1985 gains recovered due to late season rains. Season-long gains averaged 0.61 kg day-1 in 1984 and 0.69 kg day-1 in 1985. Daily gains of steers increased linearly with increased herbage mass (P < 0.05), but slopes were different due to a year X species interaction. Daily gains peaked at a herbage height of 41 cm in 1984, but increased linearly throughout the range of the data (75 cm) in 1985. Individual animal gains decreased linearly with increasing stocking rate such that maximum gain per hectare was achieved at about 5 animals ha-1 (standard 500 kg). The data suggest that maintaining higher herbage mass and height of OWB forage improves animal performance and support the practice of intensive early grazing and removing cattle by late July when rate of gain declines.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003324
    Scopus Count
    Collections
    Journal of Range Management, Volume 51, Number 4 (July 1998)

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