Quadratic effects were observed on serum FGF23 in all 3 experiments and on Klotho protein at 21 d; minimal FGF23 concentrations were observed with 400, 500, and 700 IU/kg of VD3 (P < 0.05) in the 3 growth stages.
Quadratic effectswere observed on serum FGF23 in all 3 experiments andon Klotho protein at 21 d; minimal FGF23 concentrationswere observed with 400, 500, and 700 IU/kg ofVD3 (P < 0.05) in the 3 growth stages.