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Abstract
The objective of this trial was to determine the nutritive value of cottonseed cake (CSC) compared with solvent extracted (SBM) or expeller soybean meal (ESM). The CSC was produced by dry extruding whole cottonseed at 121 to 149 C for 12-20 sec. Treatments includes three dietary protein sources: SBM and ESM (CONT); CSC and ESM (CSBM); and CSC and SBM (CESM). No differences were observed in intake, milk yield or percentage of milk fat, lactose, or solid-not-fat. However, milk protein percentage was lower for CSBM compared with CONT but not different to CESM. Milk protein percentage was lower for CSBM compared with CONT but not different to CESM. Milk urea nitrogen (MUN) concentrations were lower for CSBM compared with CONT and CESM. The results of this trial indicate that the CSC can be substituted for soybean meal or heat-treated soybean meal without affecting intake, milk yield and composition. The lower MUN observed for CSBM suggest that substituting the CSC for SBM may have limited degradable nitrogen.