We usually use Servitech Labs in Dodge City when we send ours in. This is what their livestock water test analyzes:
Livestock Water Suitability
(Suggested for use with drinking water for all livestock)
Nitrate-nitrogen, Chloride, Sulfate-sulfur, Calcium, Magnesium, Sodium, Potassium, Total dissolved solids, Total hardness, Electrical conductivity, Water pH, Livestock hazard ratings