title: In vitro evaluation of protein degradability in the rumen and digestibility of undegraded protein.
abstract: A three-phase laboratory procedure suitable for predicting protein degradability in the rumen and digestibility of undegraded protein is reported. In the first phase the feed was incubated with starch and buffered rumen fluid. In the incubation mixture the viability of protease-active bacteria was checked by anaerobic culturing, whereas changes in protease activity were monitored by azocasein degradation. In the second and third phase rumen undegradable protein (UDP) was digested with pepsin and pancreatin, respectively. The measurements showed that 63.2, 5.2 and 4.7% of the crude protein of green lucerne was decomposed by rumen fluid, pepsin and pancreatin, respectively. Degradability of the crude protein of extracted sunflower meal was 68.3, 17.7 and 5.5% in the three phases, respectively. Repeated determination yielded crude protein degradabilities of 66.7, 27.1 and 5.1% for the three phases, respectively.
authors.forename: T
authors.initials: T
authors.lastname: Veresegyházy
authors.forename: A
authors.initials: A
authors.lastname: Nagy
authors.forename: S
authors.initials: S
authors.lastname: Fekete
authors.forename: F
authors.initials: F
authors.lastname: Kutas
mesh_terms: D000821:Animal Feed; D000818:Animals; D001419:Bacteria / Q000378:metabolism; D004044:Dietary Proteins / Q000378:metabolism*; D004063:Digestion; D008297:Male; D012417:Rumen / Q000378:metabolism* / Q000382:microbiology; D012418:Ruminants / Q000378:metabolism*; D012756:Sheep / Q000378:metabolism
chemical_list: D004044:Dietary Proteins