Author
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Appeddu, Lisa |
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PETERSEN, M - NEW MEXICO STATE UNIV |
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RICHARDS, J - NEW MEXICO STATE UNIV |
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REMMENGA, M - NEW MEXICO STATE UNIV |
Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only Publication Acceptance Date: 7/1/2000 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: High undegradable intake protein (UIP) supplements may interact with forage quality to affect ruminal fermentation. Two in vitro experiments investigated changes in OMD, ammonia and VFA production with UIP supplements (S) and forage (F) at 3,8,13%CP over time (T; 18 or 48 h). In Experiment 1, forage was incubated with no supplement (NS), wheat middlings(WM;23%CP),or WM+feather meal(FM) at 7,16,23%UIP(32,44,55%CP). In Experiment 2, NS, WM(17%CP),or WM+FM at 9,12,15%UIP (34%CP) was supplied. In Experiment 1, OMD was increased by S vs NS(33,40+.4%;P=.01) and F CP (31,40,45+.3%;P=.01). Ammonia was increased by UIP at 48 h(SxT;P=.01). Acetate:propionate decreased as F CP increased, but increased by NS and high UIP (SxF;P=.01). Total VFA increased as F CP increased, but decreased by UIP (SxF;P=.01). In Experiment 2, NS decreased OMD in lower CP forage(SxF;P=.02). Ammonia was lowest (P=.01) in NS and highest (P=.01) in WM+FM at 9%UIP. Acetate:propionate was decreased by higher WM and F CP(SxF;P=.01). Total VFA at 48 h was decreased (P=.01) by NS vs S (60vs75+1.6 mMol) and increased(P=.01) by F CP(68,69,79+1.3 mMol). A moderate protein supplement optimized in vitro forage fermentation, with high UIP having less benefits on high protein forage. Forage degradation was most increased in the first supplemental increment. |