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Effects of dietary vitamin D3 restriction on the excretion of phosphorus (A, daily phosphorus excretion; B, dry excreta phosphorus concentration) and calcium (C, daily calcium excretion; D, dry excreta phosphorus concentration) of laying hens. Data are means ± SEM (n = 7). ∗∗, P < 0.01. Restriction, 0 IU/kg dietary vitamin D3; Regular, 1,600 IU/kg dietary vitamin D3.
