Rumen Degradability and Model Prediction of Nutrient Supply to Ruminants from Different Processed Soybean Meals

DVE2010 system was used for model prediction of nutrient supply to ruminants from soy bean meal (SBM), extruded soy bean meal (SBE) and full-fat soybean meal (FSBM). Extruded soy bean meal had the highest truly absorbed rumen undegraded protein in the small intestine (ARUP) followed by SBM and FSBM. There was no significant difference between SBE and FSBM in the case of truly absorbed rumen synthesized microbial protein (AMCP) in the small intestine and largest possible microbial protein synthesis, based on the available amount of energy at rumen level (MCPe) but SBM had a higher AMCP and MCPe compared to the other soy bean meal sources. Endogenous protein loss (ECP) was highest in SBE while there was no significant difference between SBM and FSBM in ECP. Extruded soy bean meal had highest total metabolizable protein (DVE) followed by SBM and FSBM. Modeling nutrient supply to dairy cows using DVE2010 system can offer valuable quantitative data on total amount of true protein digested in the small intestine from different sources which may be used to formulate diets to lower hazardous consequences of nitrogen leakage to environment.