University of Wyoming Extension forage specialist Anowar Islam found the best forage is a 50-50 percent mixture of meadow bromegrass with alfalfa, a 50-25-25 percent mixture of meadow bromegrass, alfalfa, and birdsfoot trefoil, and a 70-30 percent mixture of meadow bromegrass with alfalfa.
The details are in Meadow Bromegrass – Legume Mixtures for Diversified and Profitable Hay Production in Wyoming, B-1327.
The bulletin is available for free viewing and download by going to uwyo.edu/uwe and clicking on the “Find a Publication” link. Type the title or number in the search field. The publication is available in pdf, HTML or ePub formats.