You take care of the grass and it will take care of you. You have to put back as well with fertilzer's or legumes that put back. You will hear people to tell you to plant coastal,bahia's, tifton etc.
The secret is finding what produces the most grass on your soil for the longest time with maximum head of cattle. I have about five different varities growing mainly bahia and three varities of bahia. I also have common bermuda, Alica, African Star, Dallas grass growing in different pastures almost forgot the Red River crab grass. Crimson S-1 White Dutch and Rye, are getting after right now.
IMO I believe it as simple as being a grass farmer.
Good Grass= good teeth and better health.
I had a guy ask one time what is the best grass I responded what grows best in your pasture.