Changes in Concentrations of Tannins, Total Phenolics, Crude Protein, and In Vitro Digestibility of Browse due to Mastication and Insalivation by Cattle
Issue Date
1987-09-01Keywords
Acer saccharum subsp. grandidentatummastication
Quercus gambelii
saliva
phenolic compounds
Purshia tridentata
browse plants
esophagus
tannins
crude protein
cattle
in vitro digestibility
Utah
Cercocarpus montanus
Metadata
Show full item recordCitation
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 ManagementJournal
Journal of Range ManagementDOI
10.2307/3899598Additional 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
textArticle
Language
enISSN
0022-409Xae974a485f413a2113503eed53cd6c53
10.2307/3899598