This link provided by NDSU Extension very briefly runs through a large array of feed products utilized for ruminants. The array of feed possibilities listed have a very blunt description. Then, theres a large table describing the feed attributes commonly associated with that product.
SmartMix is the best cover crop decision making tool in the industry. Get ratings for species suitability based on goals, planting dates, geographic location C:N ratio, nitrogen fixation, grazing suitability, frost tolerance and more.