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Effects of dietary vitamin D3 restriction on mRNA levels of FGF23, FGFR, KLOTHO and VDR in the (A) calvaria and (B) kidney of laying hens for 21 d. Data are means ± SEM (n = 7). ∗, P < 0.05; ∗∗, P < 0.01. FGF23 = fibroblast growth factor-23; FGFR = fibroblast growth factor receptor; VDR = vitamin D receptor. Restriction, 0 IU/kg dietary vitamin D3; Regular, 1,600 IU/kg dietary vitamin D3.
