RE: Alfalfa Food Plot
I was not aware of there being any round up ready alfalfa.
I grew alfalfa for years as a hay crop. Be sure to have soil tested and proper pH if you are serious about planting it. Weavils could be a problem in the spring. The neighbor harvesting it, could provide enough income to offset the cost. In general, alfalfa is costly crop to plant and maintain especially if you don't have well drained, fertile soil.
Life expectency of a dairy quality alfalfa field is generally about 3 years in my area (central MO) in well drained bottom land. I don't know what type of quality horses need, but I assume it is similar. I hope your neighbor has heard about blister beatles if they are around your area. Alfalfa is call the queen of legumes, but it can be a real pain in rear end to produce economically.