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    • Journal of Range Management, Volume 40 (1987)
    • Journal of Range Management, Volume 40, Number 5 (September 1987)
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    Changes in Concentrations of Tannins, Total Phenolics, Crude Protein, and In Vitro Digestibility of Browse due to Mastication and Insalivation by Cattle

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    Author
    Burritt, E. A.
    Malechek, J. C.
    Provenza, F. D.
    Issue Date
    1987-09-01
    Keywords
    Acer saccharum subsp. grandidentatum
    mastication
    Quercus gambelii
    saliva
    phenolic compounds
    Purshia tridentata
    browse plants
    esophagus
    tannins
    crude protein
    cattle
    in vitro digestibility
    Utah
    Cercocarpus montanus
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    Citation
    Burritt, E. A., Malechek, J. C., & Provenza, F. D. (1987). Changes in concentrations of tannins, total phenolics, crude protein, and in vitro digestibility of browse due to mastication and insalivation by cattle. Journal of Range Management, 40(5), 409-411.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/645144
    DOI
    10.2307/3899598
    Additional Links
    https://rangelands.org/
    Abstract
    The feasibility of using esophageal extrusa to monitor dietary tannin levels was studied using 4 shrub species (Purshia tridentata, Quercus gambelii, Cercocarpus montanus and Acer grandidentatum). Browse samples were hand-harvested in late summer. Half of the sample for each species was fed to esophageally fistulated cattle, while the other half served as an unmasticated control. Extrusa and control samples were analyzed for total phenolics (Folin-Denis), tannin using 3 methods (vanillin-HCl, proanthocyanidins, and astringency), crude protein, and in vitro organic matter digestibility (IVOMD). Tannin levels were reduced 10% to 60% in extrusa, depending on plant species and method of tannin analysis. Changes in the nutritional constituents of extrusa were limited but oak extrusa was higher in IVOMD than oak control samples. Tannins may have bound to plant or salivary proteins or to mucous membranes in the mouth during mastication and insalivation. Our results indicate that esophageal extrusa is not suitable for monitoring dietary tannin levels.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3899598
    Scopus Count
    Collections
    Journal of Range Management, Volume 40, Number 5 (September 1987)

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