Have you considered talking to your local county extension office? They would be in the best position to make suggestions about what works for your area with regard to rainfall, etc., and also help you with the soil test to determine what your soil is lacking, if anything. We raise alfalfa and feed it to the cows, but ours are used to it. If yours aren't alfalfa can cause bloat and the runs. There are a lot of good grasses out there than can be mixed with the alfalfa, but I don't know which ones will grow in your area and which ones won't. Another option would be grass mixed with some type of clover.