אסיף מאגר המחקר החקלאי

Use of 1α-Hydroxyvitamin D3 in Prevention of Bovine Parturient Paresis. 8. Maternal and Neonatal Plasma Calcium, Parathyroid Hormone, and Vitamin D Metabolites Concentrations

Year:

1988

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Volume :

71

Co-Authors:

Bar, A., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Striem, S., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Perlman, R., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Sachs, M., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel

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Abstract:

Thirteen Israeli Friesian cows (3.71 average calvings) in the second or later lactation, fed a daily diet containing 90 g of Ca and 50 g of P, were injected once intramuscularly with 700 μg 1α-hydroxyvitamin D3 in order to investigate its placental transfer and its subsequent metabolism in the neonate. The injection of the vitamin 96 to 24 h before calving slightly increased plasma Ca at parturition, whereas uninjected controls displayed a prominent hypocalcemia. On the 10th and 20th d after calving, difference in the plasma Ca concentration of the two groups was not significant. At parturition, plasma parathyroid hormone concentration was significantly higher and plasma 1,25-dihydroxyvitamin D lower in the control than in the treated cows. At parturition the plasma concentrations of Ca, parathyroid hormone, hydroxyproline, and 24,25-hydroxyvitamin D were higher in the calves than in their dams. Plasma concentrations of 25-hydroxyvitamin D were markedly higher and 1,25-hydroxyvitamin D was slightly higher in cows than in their offsprings. Plasma Ca and 1,25-hydroxyvitamin D were higher in calves of treated cows than in the respective controls. A high concentration of 1α-hydrovitamin D3 was observed in the plasma of calves of treated cows. However, 24 h after birth, the plasma concentration of 1α-hydroxyvitamin D3 became undetectable and plasma 1,25-hydroxyvitamin D concentration was similar to that of the calves of the control cows. Plasma Ca remained high for at least an additional 10 d in calves of treated cows. © 1988, American Dairy Science Association. All rights reserved.

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