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    • Journal of Range Management, Volume 44 (1991)
    • Journal of Range Management, Volume 44, Number 6 (November 1991)
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    Bias in aging feral horses

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    Author
    Garrott, R. A.
    Issue Date
    1991-11-01
    Keywords
    age structure
    age determination
    feral herds
    horses
    
    Metadata
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    Citation
    Garrott, R. A. (1991). Bias in aging feral horses. Journal of Range Management, 44(6), 611-613.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644673
    DOI
    10.2307/4003046
    Additional Links
    https://rangelands.org/
    Abstract
    Several investigators studying feral horses (Equus caballus) in the western U.S. have noted anomalies in the age distribution of captured horses that raised concern about the accuracy of aging technique. Possible biases in the aging technique were investigated by assembling records for 60,116 horses removed from public lands in Nevada, Oregon, and Wyoming between 1975 and 1987. Records were consolidated for each state and the resulting age distributions were compared to an expected distribution derived from a population model based on published demographic parameters. These comparisons revealed a tendency for 5-year-olds to be under represented while 6- and 7-year-olds were over represented. There were also higher than expected numbers of horses aged as 15 and 20 years. These apparent anomalies were consistent among states and also among years within each state. The pervasiveness of the trends demonstrates that several biases exist in the current aging technique. Given these uncertainties, it is recommended that development of age-specific demographic variables based on yearly increments beyond age 3 or 4 be avoided, instead lumping data into broad age classes whenever possible.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003046
    Scopus Count
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    Journal of Range Management, Volume 44, Number 6 (November 1991)

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