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  • Title: Plasma levels of vitamin D metabolites in fetal and pregnant ewes.
    Author: Paulson SK, DeLuca HF, Battaglia F.
    Journal: Proc Soc Exp Biol Med; 1987 Jul; 185(3):267-71. PubMed ID: 3601947.
    Abstract:
    The plasma concentrations of calcium; inorganic phosphorus; 25-hydroxyvitamin D; 24,25-dihydroxyvitamin D; and 1,25-dihydroxyvitamin D were determined in sheep maternal and fetal arterial circulations. In addition, plasma concentrations of 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D were determined simultaneously across the uterine and umbilical circulations. Fetal arterial levels of calcium (r = 0.560); inorganic phosphorus (r = -0.095); and 1,25-dihydroxyvitamin D (r = 0.040) were significantly higher than and did not correlate with maternal arterial levels. Maternal levels of 25-hydroxyvitamin D were significantly higher than and correlated (r = 0.693) with fetal 25-hydroxyvitamin D levels. No significant difference existed between maternal and fetal arterial levels of 24,25-dihydroxyvitamin D. No significant difference was detected in the concentrations of 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D across the uterine or umbilical circulations.
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