FIGURE 4.

Association between plasma and egg yolk vitamin D₃ metabolite concentrations from 78-wk Hy-Line Brown laying hens fed different concentrations of dietary vitamin D₃. (A) Cholecalciferol (vitamin D₃) (B) 25-hydroxycholecalciferol (25-OH-D₃). Blue squares denote the standard NRC range vitamin D₃ concentration (400 IU D₃/kg, n = 4) in diet; orange (14,000 IU D₃/kg, n = 4) and red diamonds (36,000 IU D₃/kg, n = 4) denote super-dose concentrations of vitamin D₃ in diet (Pearson correlation). NRC, National Research Council.