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Evaluation of Calcium Lignosulfonate-Treated Soybean Meal as a Source of Rumen Protected Protein for Dairy Cattle

[ lysine, cannulae, amino acids ]

Four Holstein cows fitted with ruminal, duodenal, and ileal cannulae were used to measure ruminal protein degradation and small intestinal digestion of diets containing untreated solvent extract soybean meal (SBM), soybean meal that was treated with water and heat (H20-SBM), and soybean meal that was non-enzymatically browned using either 1% xylose (Xylose-SBM) or 5% lignosulfonate (LSO3-SBM). The latter two treatments represent alternate methods for the manufacture of SoyPass.

 
Lysine levels, g/day
 

Intake

Absorbed in
small intestine

SBM

134
122

H20-SBM

121
135

Xylose-SBM*

135
196

LSO3-SBM*

132
167

*Non-enzymatically browned SBM = SoyPass

Lysine absorption in the small intestine was higher than the intake level for the two SoyPass treatments. This is because a high proportion of the dietary lysine was transferred to the small intestine without degradation in the rumen. This dietary lysine was added to the bacterial lysine to produce a net increase.

Paul M. Windschitl and M. D. Stern, (1988), J Dairy Sci 71:3310-3322