Can't go wrong with beans of any sort. They are high protein and high calcium. Im sure there are designer plantings for your area. Buddy of mine also supplemented with Cotton Seed ... it's crazy but they'll eat it. It's high protein and doesn't need water to grow.
Get some soil samples and send them to the Texas A&M soils lab for analysis of acidity and N P K so you can get a fertilizer recommendation.. at least a starter. You're biggest concern is going to be planting in the middle of summer heat.. those plants are going to wilt hard and fast with no establish root system in sandy loam soils. You might have to wait to plant in sept. or plant some type of winter crop at that time.
Cows.. I'll let someone else cover that.
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