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Effect of the Maternal Vitamin D Status at Parturition on the Vitamin D Status of the Neonatal Calf

National Animal Disease Center, Agricultural Research Service, U. S. Department of Agriculture, P.O. Box 70, Ames, IA 50010

The plasma concentrations of calcium, phosphorus, magnesium, hydroxyproline, vitamin D, and vitamin D metabolites were determined in cows and their colostrum-deprived calves. At birth, calf plasma calcium, phosphorus, and hydroxyproline concentrations were not correlated (P > 0.05) with the maternal plasma concentrations of these substances. There was a high degree of correlation between maternal and neonatal calf plasma concentrations of 25-hydroxyergocalciferol (r = 0.733), 25-hydroxycholecalciferol (r = 0.888), 24,25-dihydroxyergocalciferol (r = 0.770), 24,25-dihydroxycholecalciferol (r = 0.629), and 25,26-dihydroxycholecalciferol (r = 0.840). Neonatal calf plasma concentrations of 1,25-dihydroxyvitamin D were low (41.2 ± 3.4 pg/ml) and had no correlation with maternal concentrations (r = 0.219, P > 0.05). Neonatal plasma calcium and inorganic phosphorus concentrations were correlated (P < 0.05) with maternal plasma concentrations of 1,25-dihydroxyvitamin D (r = 0.559 and 0.525, respectively). Vitamin D status of the dam, therefore, appears to be important in determining neoatal calf plasma concentrations of 25-hydroxyvitamin D, 24,25-dihydroxyvitamin D, and 25,26-dihydroxyvitamin D, and, in addition, the plasma calcium and inorganic phosphorus status of the neonatal calf is apparently dependent on maternal concentratios of 1,25-dihydroxyvitamin D.

KEY WORDS: • vitamin D • neonate • maternal • vitamin D metabolites • calcium • phosphorus

¹ Author to whom correspondence should be addressed.

Manuscript received 8 December 1981.