An interactive spreadsheet version of Cornell FORVAL is available on the internet at a preliminary address (http://forval.css.cornell.edu/forval%202006.aspx).  The model uses current market information and forage test results for hay or silage to calculate a fair market price of the tested forage.  It is possible to estimate a range in the calculated price based on the expected range in test results, usually 2 to 3% units for crude protein (CP) and total digestible nutrients (TDN).  The reference feed prices that must be input are averages for alfalfa hay, grass hay, energy concentrate, and protein concentrate.  Number 2 corn grain and high protein soybean meal are the concentrate feed defaults, but other concentrates (e.g. fishmeal or distillers grains) can be easily substituted into the program.  The market price for low-cost grass hay is also needed.  A separate web page for the model is available with current market information for New York State (http://www.css.cornell.edu/courses/312/market.htm).   Forage test results that must be input are adjusted CP, neutral detergent fiber, and TDN, each as a percentage of dry matter.  The moisture content is also required as a percentage of fresh weight.  The benefit of knowing a fair market price is that it will help a producer to be rewarded for good management and a buyer to avoid excessive prices for low quality feed.  Of course, the results are only as good as the forage test.  An older version of the model has been useful for teaching hay evaluation, for enterprise budgeting with forages, and for research and decision making in which management practices could be predicted to cause known changes in forage quality.