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Effects of dietary supplementation of 25OHD on hen day production from 18 to 90 wk. From the optimal production data from Hy-Line W36 guide (2015). Abbreviations: D, vitamin D3 at 2,760 IU/kg; DD, vitamin D3 at 5,220 IU/kg; 25HD, vitamin D3 at 2,760 IU/kg plus 25OHD at 2,760 IU (69 μg)/kg; 25OHD, 25-hydroxyvitamin D3.
