A technical paper was prepared on how soyhulls, whole soybeans, and various types of soybean meals can be used effectively in diets with little or no alfalfa. The advantages and limitations of using these products in low alfalfa diets were also discussed. Because of high production costs and agronomic challenges, alfalfa production in the US is decreasing which means the amount of alfalfa included in dairy cow diets is also decreasing. Alfalfa provides numerous nutrients to cows but the three that have the greatest economic value are metabolizable protein (MP), forage neutral detergent fiber (fNDF) and net energy (NEL). Soy protein sources can efficiently completely replace the MP provided by alfalfa. Because soy protein is more digestible than alfalfa protein the efficiency of converting crude protein (CP) to MP is greater when soy replaces alfalfa. This means diets with less alfalfa and more soy can be formulated to have lower concentrations of CP but will provide the same amount of MP. This often will reduce diet costs and will always reduce manure excretion of nitrogen. The MP/CP efficiency improvement may be even greater than expected as soy replaces alfalfa because of the composition of the rumen degradable protein fraction is almost exclusively peptides and proteins in soy which can be used more efficiently by rumen microbes to produce microbial protein tnan other forms of degradable crude protein. A primary reason alfalfa is included in dairy diets is because it provides high quality fiber that cows must chew and ruminate. Soyhulls are the only soy product that contains appreciable amounts of NDF, but it is NDF that does not elicit chewing (an essential process to maintain rumen and cow health). Therefore, soy cannot replace the NDF provided by alfalfa. However, soyhulls can be used to reduce starch concentrations in diets which reduces the requirement for fNDF. In many, perhaps most, situations where alfalfa is removed from diets, corn silage is increased. This will provide fNDF but it also provides starch. Because starch concentrations must be limited (~30% of diet dry matter) to maintain rumen and cow health, soyhulls are a useful ingredient in high corn silage, low alfalfa diets because they are moderate in NEL without increasing the starch load in the diet. Example diets that use soyhulls and soy protein to replace some or all of the alfalfa are included in the white paper.