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    • Journal of Range Management, Volume 40 (1987)
    • Journal of Range Management, Volume 40, Number 4 (July 1987)
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    Modeling Variation in Range Calf Growth Under Conditions of Environmental Uncertainty

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    Author
    VanTassell, L. W.
    Heitschmidt, R. K.
    Conner, J. R.
    Issue Date
    1987-07-01
    Keywords
    growth models
    variance
    liveweight gain
    calves
    Texas
    climatic factors
    rangelands
    grazing
    
    Metadata
    Show full item record
    Citation
    VanTassell, L. W., Heitschmidt, R. K., & Conner, J. R. (1987). Modeling variation in range calf growth under conditions of environmental uncertainty. Journal of Range Management, 40(4), 310-314.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/645207
    DOI
    10.2307/3898726
    Additional Links
    https://rangelands.org/
    Abstract
    Functional relationships between calf weights and various managerial and environmental factors were developed using 19 years of performance data from 8 cow-calf herds at the Texas Experimental Ranch. Six models were developed to estimate weights at (1) the first weighing at approximately 75 days of age, (2) the second weighing at approximately 152 days of age, (3) the second weighing, using the first weight as a dependent variable, (4) weaning at approximately 237 days of age, (5) weaning, using the first weight as a dependent variable, and (6) weaning, using the second weight as a dependent variable. R2 values for the equations were .79, .83, .90, .84, .89, and .89, respectively. Equations were functions of the grazing treatment (heavy continuous vs. moderate continuous vs. rotational grazing), level of winter supplementation, age of calf at weighing, crossbreeding, linear and quadratic accumulated production year precipitation, and winter/spring temperatures. Performance of the equations was examined by stochastically simulating them for 360 iterations using 36 years of historical precipitation.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3898726
    Scopus Count
    Collections
    Journal of Range Management, Volume 40, Number 4 (July 1987)

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