Serum-Se concentrations (ng/mL) in ewes after weekly oral drenching with no Se, inorganic Se (Na-selenate or Na-selenite), and organic Se (Se-yeast) at varying supplementation rates (4.9, 14.7, and 24.5 mg Se/wk; Na-selenate only at 8.95 mg Se/wk) for 62 wk.¹

1Adapted from [1]; numbers differ because all sheep are included here and classified as healthy or footrot-affected. 2The largest SEM of the 8 treatment groups is shown. 3Number of healthy sheep in each treatment group. 4Least squares means. 5Number of footrot-affected sheep in each treatment group.