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Synchronization of feed sources of energy and protein can produce a positive influence on microbial protein synthesis, especially in ruminants that are fed low quality feed such as corn waste. Corn waste, including corn straw and corn peri carp are widely used as beef cattle feed. The objective of this research was to determine the effect of synchronizing the rate degradation of protein and energy of feed base on corn waste on rumen fermentation characteristic and synthesis protein microbial on 24 hours  in vitro  condition. The three synchronization index levels in corn-based feed waste are 0.4 (low); 0.5 (moderate) and 0.6 (high) were used in this study. Characteristics of rumen fermentation observed were pH, individual volatile fatty acids (acetic acid, propionic acid and butyric acid), NH 3 , C0 2 , CH 4 , degradation of organic matter, microbial protein production, and efficiency of microbial protein synthesis. Increasing the synchronization index level caused a significant increase (P&lt;0.05) of NH 3  (53.60 to 59.07 mg/L) and efficiency of microbial protein synthesis (14.83 to 17.87) , but high synchronization index decrease (P&lt;0.05) the concentration of acetic acid (22.45 mM to 15.95 mM), estimated CO 2  (18.69 to 15.50 mol) and CH 4  (11.49 to 7.98) in rumen fluid. This result indicated that the improvement of synchronization index can improve the productivity of livestock through increase efficiency of microbial protein synthesis and it reduce global warming.

iop conference series. earth and environmental science

Effect of synchronizing the rate degradation of protein and organic matter of feed base on corn waste on fermentation characteristic and synthesis protein microbial