PRODUCTS National Comparison National Comparison National Feedbase Summary Compare Feedbase Maps Case Studies & Testimonials Explore the National Comparison tool for up-to-date insights into feedbase and groundcover changes, updated every 5 days. Changes in conditions can be viewed through the use of the slider scale to move backwards to the previous records. The National Comparison can be done in selecting layers that include: Total Standing Dry Matter (TSDM) Ranking of seasonal change in Totals Standing Dry Matter Green Standing Dry Matter Dead / Dry Standing Dry Matter