Department of Animal Science


Date of this Version



2018 Nebraska Beef Cattle Report. University of Nebraska Extension MP105. Lincoln, NE.


© 2017 The Board Regents of the University of Nebraska.


Two studies were conducted to determine rumen undegradable protein (RUP) content and digestibility in corn silage. In Exp. 1, 37 and 42% DM corn silage were incubated in situ with two ruminally and one duodenally cannulated steer to calculate RUP content and RUP digestibility. In Exp. 2, dry rolled corn was reconstituted to 75, 70, 65, and 50% DM and ensiled in mini silos for 30, 90, 180, or 270 days. After ensiling, samples were ruminally incubated to determine RUP content of the grain. The grain within corn silage is less than 50% DM, as moisture content increases and time of ensiling increases, RUP content of this grain decreases. Results from these experiments suggest the RUP content of corn silage is 10% of the CP or the CP within corn silage is 90% rumen degradable protein.