Sampling of 14 herds showed an average whole blood selenium level of 0.117 ppm which would be considered adequate. However, all of these herds were providing at least an over-the-counter trace mineral supplement. When individual herds were considered, 2 herds were Se deficient (0.036 and 0.048 ppm), despite the use of trace mineral salt supplements. It is difficult to interpret these sample results due to supplementation. However, considering that supplement was provided and some herds were deficient, it is likely Se is deficient in at least portions of the county.

Individuals should consult the How to Diagnose section to evaluate the mineral status for specific locations.

Similar to the situation for selenium, copper status in Mono county is marginal and variable. Fourteen herds had an average serum copper level of 0.64 ppm, which is considered marginal. Of the fourteen herds, 4 had adequate levels of copper, with the others marginal. Complicating the issue is serum molybdenum levels varied between less than .01 ppm to 0.36 ppm. Since molybdenum can interfer with copper creating secondary copper deficiency (even when serum copper is adequate), the potential for secondary copper deficiency is strong.

Individuals should conduct further sampling, that includes both cattle and forage levels for copper and molybdenum.

Zinc is adequate based on samples from fourteen herds which had an average serum zinc level of 1.59 ppm. None of the herds had zinc levels below adequate.

Phosphorus is adequate based on samples from fourteen herds which had an average serum phosphorus level of 100 ppm. None of the herds had phosphorus levels below adequate.