Cornell University has developed a new web-based app that helps time first-cut harvest by estimating the NDF (neutral detergent fiber) content of alfalfa-grass mixtures. The app works on a computer or smartphone. Though targeted for dairy, delaying the predicted date by a few weeks should increase yield and produce a nutrient quality suitable for beef cows.  If you are finishing cattle on forage, this tool will help to predict best time to make baleage for wintering calves. For details go to http://blogs.cornell.edu/ccefieldcropnews/2016/05/10/new-alfalfa-grass-ndf-estimation-tool-for-smart-phones/.