Effect of adding lignosulfonate and heat to canola screenings on ruminal and intestinal disappearance of dry matter and crude protein

The effect of adding 5% calcium lignosulfonate (LSO3) and heat to canola sc reenings on in situ ruminal and intestinal dry matter (DM) and crude protei n (CP) disappearance in Holstein cows was investigated. Treatments consiste d of untreated canola screenings, canola screenings that had been heated to 100 degrees C for 30 or 60 min and canola screenings that had 5% (wt wt(-1 )) LSO3 added and were subsequently heated at 100 degrees C for 0, 30 or 60 min. Results indicate that treatment of canola screenings with 5% LSO3 and heated to 100 degrees C for 60 min was effective in reducing rumen degrada tion of DM and CP with a corresponding increase in disappearance in the low er gastrointestinal tract when compared to untreated and heat-treated canol a screenings.