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    • Rangeland Ecology & Management, Volume 64 (2011)
    • Rangeland Ecology & Management, Volume 64, Number 3 (May 2011)
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    Effects of Plant Secondary Compounds on Nutritional Carrying Capacity Estimates of a Browsing Ungulate

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    Author
    Windels, Steve K.
    Hewitt, David G.
    Issue Date
    2011-05-01
    Keywords
    Acacia berlandieri
    Acacia rigidula
    nutrition
    Odocoileus virginianus
    phenolic amines
    tannin
    
    Metadata
    Show full item record
    Citation
    Windels, S. K., & Hewitt, D. G. (2011). Effects of plant secondary compounds on nutritional carrying capacity estimates of a browsing ungulate. Rangeland Ecology & Management, 64(3), 264-275.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642866
    DOI
    10.2111/REM-D-10-00078.1
    Additional Links
    https://rangelands.org/
    Abstract
    Carrying capacity estimates based on digestible protein (DP) and energy (DE) are useful in comparing effects of land management practices or the ability of different vegetation communities to support herbivores. Plant secondary compounds that negatively affect forage quality would be expected to change nutritionally based estimates of carrying capacity. We evaluated the effect of plant secondary compounds on nutritionally based carrying capacity estimates of white-tailed deer (Odocoileus virginianus Zimmerman) in Tamaulipan thorn scrub of northern Mexico. Forage biomass, nutrient concentration, and tannin concentration (protein- precipitating capacity) were measured for 23 forage items during spring and summer in three replicate pastures. Nitrogen in phenolic amines was estimated for the two principal woody browse species in deer diets and was assumed to be unavailable for amino acid synthesis. Carrying capacity estimates were calculated based on three dietary concentrations of DP and DE. Nutritional carrying capacity estimates that accounted for antinutritional compounds were reduced 50+/-6%, 28+/-8%, and 0+/-0% (mean +/- SE) for diets of high, medium, and low DE concentration, respectively, compared to estimates from models that ignored the effects of these compounds. Accounting for effects of plant secondary compounds reduced DP-derived carrying capacity estimates 4 +/- 3%, 47 +/- 9%, and 9 +/- 8% for diets with high, medium, and low concentrations of DP, respectively. High variation in percent reduction in carrying capacity estimates occurred because of site and seasonal variation in plant species composition and biomass, making application of a single correction factor to account for plant secondary compound effects on carrying capacity infeasible. Protein-precipitating capacity of tannins accounted for > 98% of the reductions in carrying capacity estimates based on DP. Our results clearly demonstrate the need to consider effects of tannins on ungulate carrying capacity estimates based on DP and DE. Estimates can be further refined by accounting for nonprotein nitrogen and other antinutritional compounds in all forage items.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-10-00078.1
    Scopus Count
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    Rangeland Ecology & Management, Volume 64, Number 3 (May 2011)

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