http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Phosphorus and other nutrient disappearance from plants containing condensed tannins using in situ and mobile nylon bag techniques
Plants containing condensed tannins (CT) represent an alternative feed resource for ruminants. However, limited information regarding nutrient disappearance from these plants is available. Two experiments were conducted to evaluate phosphorus (P) and other nutrient disappearance from plants containing CT. In the first experiment, nutrient disappearance from three native Texas species (Acacia angustissima var. hirta, Desmodium paniculatum, Smilax bona-nox, and Medicago sativa as control) were evaluated using the mobile nylon bag technique. For the second experiment, ruminal degradation parameters, ruminal and post-ruminal disappearance of P and other nutrients from a browse containing CT (Quercus virginiana) were compared to species without CT (Cynodon dactylon cv. Tifton 85, and Medicago sativa). Results from the first experiment indicate that the proportion of nutrient that disappeared during rumen, pepsin/HCl, or intestinal incubation differed among plant species and nutrient evaluated (P<0.05) and did not appear to be directly related to relative CT concentrations. Dry matter (DM), inorganic matter (IM), and organic matter (OM) disappearance were greater (P<0.05) during rumen incubation than at other stages for all plants evaluated. Of the plants containing CT, A. angustissima demonstrated the greatest overall disappearance of DM, CP, P, and OM. A greater proportion of A.angustissima and D. paniculatum crude protein (CP) and P disappearance occurred in the intestines compared to S. bona-nox and M. sativa. Plants evaluated in the second experiment differed (P<0.05) among all degradation parameters (rapidly degradable fraction, slowly degradable fraction, and fractional rate of degradation) for DM, OM, and IM. Medicago sativa and C. dactylon had high ruminal and post-ruminal nutrient disappearance (P<0.05) compared to Q.virginiana. The presence of CT appears to reduce total P disappearance and shift disappearance from the rumen to the intestines in some plants containing CT.
Title from author supplied metadata (automated record created 2011-02-28 11:02:00).
Doctor of Philosophy Texas A&M University 2009 http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7368