Abstract
Dairy cows require sufficient protein in the diet to optimize microbial growth and adequate amounts of essential AA to be available in the small intestine to provide for their increased metabolic and lactation demands. Soybean meal (SBM) is the most commonly used protein supplement and is an excellent supplemental protein in dairy diets because of good palatability, as well as high availability and similar AA balance relative to the composition of milk protein. However, relative to other protein sources, SBM has a low AA efficiency because of extensive ruminal degradation. The objective of this experiment was to determine the effectiveness of xylose-treated of soybean meal (XSBM) on the productive performance of lactating cows fed XSBM as the major source of rumen undegradable protein (RUP).
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