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    • Journal of Range Management, Volume 45 (1992)
    • Journal of Range Management, Volume 45, Number 2 (March 1992)
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    Effect of restricted forage intake in confinement on estimated fecal output from a sustained release bolus

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    Author
    Pinchak, W. E.
    Hutcheson, D. P.
    Issue Date
    1992-03-01
    Keywords
    chromium
    captec bolus
    boluses
    excretion
    estimation
    feces composition
    sampling
    steers
    cattle feeding
    quality
    beef cattle
    forage
    feed intake
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    Citation
    Pinchak, W. E., & Hutcheson, D. P. (1992). Effect of restricted forage intake in confinement on estimated fecal output from a sustained release bolus. Journal of Range Management, 45(2), 129-132.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644698
    DOI
    10.2307/4002768
    Additional Links
    https://rangelands.org/
    Abstract
    Two experiments were conducted to investigate the effects of restricted forage intake on patterns of chromium excretion to determine sample window duration and the accuracy and precision of fecal output estimates derived from the Captec Chrome sustained release bolus. In Experiment 1, 8 crossbred steers (mean = 243 +/- 14 kg) were assigned randomly to receive prairie hay (PH) at intake levels of either 1.12% body weight (BWT) or 0.75% BWT while maintained in individual metabolism crates and(or) pens. In Experiment 2, steers from Experiment 1 were rerandomized and assigned to receive PH at either 1.12% BWT or alfalfa hay (AH) at 1.30% BWT. The average post-dosing bolus failure rate across experiments exceeded 30%. Estimated fecal output exceeded actual fecal output under all experimental conditions (P<0.08). Averaged across experiments, fecal chromium recovery was low (mean = 55 +/- 4%). When estimated fecal output was corrected for mean marker recovery within treatment, it did not differ from actual fecal output (P>0.60). Treatment effects were similar for estimated fecal output, corrected estimated fecal output, and actual fecal output. Under conditions of pen feeding and restricted forage intake, estimated fecal output exhibited treatment differences similar to those of total fecal collection. However, unless adjusted for average marker recovery, these estimates were significantly greater than actual fecal output.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002768
    Scopus Count
    Collections
    Journal of Range Management, Volume 45, Number 2 (March 1992)

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