Abdelgadir, I.E.O.Cochran, R.C.Vanzant, E.S.Titgemeyer, Evan C.2010-09-082010-09-082010-09-08http://hdl.handle.net/2097/4857Ruminal degradation of alfalfa and prairie hay protein was estimated using a proteolytic enzyme from Streptomyces griseus with or without pretreatment with cellulase or a broad spectrum carbohydrase (driselase). Estimates of the undegradable intake protein (UIP) as a percentage of total protein derived from the protease alone were higher than that measured in the animal (i.e., in vivo). Pretreatment of hay samples with cellulase (48 h incubation) or driselase improved the accuracy of UIP predictions compared with those determined using the protease alone.BeefProtein degradabilityCellulaseDriselaseForageConference paper