Selenium source comparison

Dairy mineral programs distinguish selenium sources by form, dose, and animal status. The discussion considers hydroxy-selenomethionine as one option for a selenium program, with attention to plasma and milk measurements. Any practical decision should consider the full mineral ration, baseline status, stress conditions, regulatory limits, and the outcome being monitored. Selenium measurements in plasma and milk provide different windows into animal status. Tissue deposition or health responses should be treated as measured endpoints rather than assumed benefits.