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    • Journal of Range Management, Volume 43 (1990)
    • Journal of Range Management, Volume 43, Number 4 (July 1990)
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    Methods of administering ytterbium for estimation of fecal output

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    Author
    Hatfield, P. G.
    Clanton, D. C.
    Sanson, D. W.
    Eskridge, K. M.
    Issue Date
    1990-07-01
    Keywords
    elements
    research methods
    markers
    feces collection
    accuracy
    estimation
    grazing experiments
    feces
    steers
    
    Metadata
    Show full item record
    Citation
    Hatfield, P. G., Clanton, D. C., Sanson, D. W., & Eskridge, K. M. (1990). Methods of administering ytterbium for estimation of fecal output. Journal of Range Management, 43(4), 316-320.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644895
    DOI
    10.2307/3898924
    Additional Links
    https://rangelands.org/
    Abstract
    Three experiments were conducted with grazing and penned animals to evaluate the accuracy and precision of different methods of administering ytterbium (Yb) as a marker to estimate fecal output. A paired t test was used to evaluate differences between marker estimates of fecal output and fecal output measured by total collection. Marker administration methods within an experiment were compared in a one-way analysis of variance using the absolute percentage deviation of the marker estimates from total collection. In Experiment 1, wethers were confined in metabolism crates and orally administered either a pulse dose or a once daily dose. Both methods overestimated fecal output (7.3% for the once daily and 11.2% for the pulse dose method); however, the once daily dose was more precise (SE = .78%) than the pulse dose (SE = 2.17%). In Experiment 2, a crossover design with steers grazing dormant bromegrass pasture was employed to compare estimates of fecal output by pulse dosing and once daily dosing of Yb via rumen cannula. Although both methods underestimated fecal output (4.0% for the once daily and 11.5% for the pulse dose), once daily dosing was more precise (SE = 2.36%) than pulse dosing (SE = 3.64%). In Experiment 3, an intraruminal constant release Yb bolus was compared with daily feeding of Yb-labeled supplement using grazing and pen fed steers. The constant release bolus overestimated fecal output 13.8% on pasture and 41.3% in the pen study. Standard errors for the constant release bolus were 4.02% (pasture) and 4.76% (pen). Although use of Yb in a labeled supplement did not provide an accurate estimate of fecal output (80.1 and 106.0% of total collection on pasture and in pen, respectively), it had a lower SE than the constant release bolus method during both the pasture and pen studies. Once daily dosing was more precise than a pulse dose for estimating fecal output in Experiments 1 and 2. The constant release bolus used in Experiment 3 does not appear to be suitable for estimating fecal output of grazing cattle.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3898924
    Scopus Count
    Collections
    Journal of Range Management, Volume 43, Number 4 (July 1990)

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