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Observation on the use of 1 alpha-hydroxyvitamin D3 in the prevention of bovine parturient paresis: the effect of a single injection on plasma 1 alpha-hydroxyvitamin D3, 1,25-dihydroxyvitamin D3, calcium, and hydroxyproline


Observation on the use of 1 alpha-hydroxyvitamin D3 in the prevention of bovine parturient paresis: the effect of a single injection on plasma 1 alpha-hydroxyvitamin D3, 1,25-dihydroxyvitamin D3, calcium, and hydroxyproline



Journal of Dairy Science 68(8): 1952-1958



ISSN/ISBN: 0022-0302

PMID: 3840185

DOI: 10.3168/jds.s0022-0302(85)81056-0

Israeli Friesian cows in the third or later lactation, were injected intramuscularly with 1 alpha-hydroxyvitamin D3 in propylene glycol. Plasma 1 alpha-hydroxyvitamin D3 peaked 24 to 48 h after 700 micrograms of the drug was injected and decreased to the initial concentration 4 d later. The disappearance rate of 1 alpha-hydroxyvitamin D3 from the blood was .330 d-1 (biological half-life of 2.1 d). Plasma 1,25-dihydroxyvitamin D3 peaked 24 to 48 h after the injection and approached the initial concentration 5 to 7 d later. Plasma calcium increased within 24 h, reached a plateau at 4 to 6 d, and then decreased. Administration of 700 micrograms 1 alpha-hydroxyvitamin D3 resulted in higher plasma 1,25-dihydroxyvitamin D3 and calcium concentrations than when 350 micrograms of the drug was injected. 1 alpha-Hydroxyvitamin D3 did not affect plasma hydroxyproline. The injection of 700 micrograms 1 alpha-hydroxyvitamin D3 52 to 36 h before parturition resulted in a greater increase in plasma 1,25-dihydroxyvitamin D3 than that obtained with 350 micrograms. In both groups 1,25-dihydroxyvitamin D3 peaked 24 h after injection, as opposed to the controls, which peaked 72 h postpartum. At parturition, the 700-micrograms dose resulted in a slight hypercalcemia; the 350-micrograms dose moderated the hypocalcemia prevalent during this period, whereas in controls hypocalcemia was more pronounced. In cows injected with 700 micrograms, hypercalcemia was observed until the 15th d postpartum. Plasma hydroxyproline was elevated in all cows 48 to 72 h after parturition, but the increase was smaller in animals injected with 1 alpha-hydroxyvitamin D3.

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