To get the best answers to your questions about a specific area, you might contact the Grayson County Cooperative Extension office located in the county courthouse in Sherman and ask for the County Agent for Agriculture. You might also consult your local USDA-National Resource Conservation Service office. A third source in your part of the state is Dr. Jason Banta (JPBanta@ag.tamu.edu), Extension Beef Cattle Specialist at the Texas AgriLife Center in Overton.