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Mean (± SE) neutrophil phagocytic activity (%) at study start, 1 and 3 mo after dietary assignment, in adult horses (n = 5 per group) receiving supplementary inorganic selenium (0.3 ppm DM, as sodium selenite), organic selenium (0.3 ppm DM, as Se yeast), or receiving no supplementary selenium (< 0.05 ppm DM)
| Study start | 1 month | 3 months | |
|---|---|---|---|
| Phagocytosis (%) | |||
| No Se | 5.8 (2.6) | 15.6 (2.2) | 20.8 (1.8) |
| Inorganic Se | 4.2 (1.4) | 16.8 (2.8) | 19.8 (3.6) |
| Organic Se | 5.8 (1.7) | 14.4 (3.9) | 32 (8.3) |
