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    • Journal of Range Management, Volume 40 (1987)
    • Journal of Range Management, Volume 40, Number 5 (September 1987)
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    Nitrogen and Energy Budgets of Free-Roaming Cattle

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    Author
    Senft, R. L.
    Stillwell, M. A.
    Rittenhouse, L. R.
    Issue Date
    1987-09-01
    Keywords
    intake
    free range husbandry
    urine
    digestible energy
    liveweight gain
    energy balance
    feces
    nitrogen
    heifers
    metabolizable energy
    Colorado
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    Citation
    Senft, R. L., Stillwell, M. A., & Rittenhouse, L. R. (1987). Nitrogen and energy budgets of free-roaming cattle. Journal of Range Management, 40(5), 421-424.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/645210
    DOI
    10.2307/3899602
    Additional Links
    https://rangelands.org/
    Abstract
    Energy and nitrogen (N) budgets of free-roaming yearling heifers were quantified. Energy and N retention were estimated from liveweight gains. Intake and excretion of N and energy were measured directly. Dry matter intake per unit metabolic body weight (MBW = Bwkg.75) varied seasonally, peaking in late growing season. Fecal dry matter output, which was related to dry matter intake, also peaked late in the growing season. Urine volume, however, peaked early in the growing season. Urinary N excretion per MBW was correlated with dietary N concentration (r = .79). Fecal N excretion per MBW was relatively constant while fecal N concentration varied. Partitioning of N losses between feces and urine varied seasonally, with 54% excreted in urine during the growing season (April through October) and 45% in urine during the dormant season (November through March). On a year-round basis, 8% of ingested N was incorporated into body tissue. Fecal energy excretion trend followed that of gross energy intake. Digestible energy intake per MBW was relatively high throughout the growing season and steadily declined after onset of the dormant season. Urinary energy output was closely related to urinary N output and peaked early in the growing season. Metabolizable energy (ME) followed dynamics similar to those of digestible energy. Net energy for liveweight gain accounted for about 8% of gross energy intake on a year-round basis. ME and crude protein intake were above maintenance requirements during the growing season, but were inadequate during the dormant season. ME intake apparently limited growth early in the growing season; protein intake was limiting late in the growing season.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3899602
    Scopus Count
    Collections
    Journal of Range Management, Volume 40, Number 5 (September 1987)

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