Table 1. Vitamin D and food ingestion, serum calcium and phosphorus and plasma 25 (OH) D3.
| Variable | C | VD3 | VD10 | p |
| Food ingestion (g/day) | 25.5±1.5 (20) | 25.9±2.2 (19) | 25.2±2.2 (21) | 0.681 |
| Vitamin D ingestion (IU/day) | 45.3 (44.2–48.2) (20) | 126.3 (116.7–128.5)* (19) | 309.2 (288.6–317.6)*# (21) | <0.001 |
| 25 (OH) D3 (ng/ml) | 15.0 (13.2–20.7) (5) | 25.5 (19.0–40.5) (5) | 37.0 (34.1–40.0)* (5) | 0.016 |
| Ca (mg/dl) | 8.24±0.36a (20) | 9.32±0.32* (19) | 9.44±0.15* (21) | 0.016 |
| P (mg/dl) | 5.90 (5.65–6.10)a (20) | 6.80 (6.35–8.00)* (19) | 7.60 (6.95–8.78)* (21) | <0.001 |
Data are expressed as mean ± standard deviation of mean or median with 25 and 75 percentiles, numbers in parentheses indicate the numbers of animals included in each experimental group. C: control group (no supplementation with vitamin D); VD3: supplemented with 3,000 IU VD/kg of chow; VD10: supplemented with 10,000 IU VD/kg of chow; 25 (OH) D3: plasma 25-hydroxycholecalciferol; Ca: serum calcium; P: serum phosphorus. * p<0.05 versus control group; # p<0.05 versus VD3 group.