title: [Protein and amino acid metabolism in the digestive tract of growing young bulls. 2. Feed protein flow into the duodenum determined with 2,6-diaminopimelic acid as a marker for crude bacterial protein].
abstract: The experimental ascertainment of the pure feed protein flowing into the duodenum on the basis of the calculation of the difference between the NH3-free crude protein flowing into the duodenum and the bacterial crude protein determined by means of DAPA showed the following results after the testing of 28 different rations at a dry matter intake adequate to the production level: With a variation of the pure protein in the crude protein content of the ration between 40 and 90%, the quota of feed protein flowing into the duodenum is 52.5%, and with a variation of the pure protein in the crude protein content between 80 and 90% it is 40.6%. The quota of feed protein flowing into the duodenum shows a negative correlation to the apparent digestibility of the organic matter (y=231.7 -2.52x +/- 14.5). With a DM-intake adequate to the production level the quota of feed protein flowing into the duodenum is neither influenced by the flow rate (kg digesta/kg DM-intake) nor by the 'dilution rate' (g bacteria-free DMD/kg live weight 0.75/h).
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D000599:Amino Acids, Diamino / Q000378:metabolism*; D000821:Animal Feed; D000818:Animals; D001426:Bacterial Proteins / Q000378:metabolism*; D002417:Cattle / Q000378:metabolism*; D003960:Diaminopimelic Acid / Q000378:metabolism*; D004044:Dietary Proteins / Q000378:metabolism*; D004063:Digestion; D004064:Digestive System / Q000378:metabolism* / Q000382:microbiology; D004386:Duodenum / Q000378:metabolism* / Q000382:microbiology; D008297:Male
chemical_list: D000596:Amino Acids; D000599:Amino Acids, Diamino; D001426:Bacterial Proteins; D004044:Dietary Proteins; D003960:Diaminopimelic Acid
vernacular_title: Untersuchungen zum Protein- und Aminosäurenumsatz im Verdauungstrakt bei wachsenden Jungbullen. 2. Mitteilung. Fluss von Futterprotein ins Duodenum bestimmt mit 2,6-Diaminopimelinsäure als Marker für das Bakterienrohprotein.