Effects of Dietary Vitamin D3 on Concentrations of Vitamin D and Its Metabolites in Blood Plasma and Milk of Dairy Cows
| Autor: | Donald C. Beitz, E. Travis Littledike, Ronald L. Horst, Colleen M. McDermott |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
Vitamin
medicine.medical_specialty 24 25-Dihydroxyvitamin D 3 Dietary vitamin chemistry.chemical_compound fluids and secretions Calcitriol Pregnancy Internal medicine Lactation Blood plasma Genetics medicine Vitamin D and neurology Animals Vitamin D Calcifediol Cholecalciferol Vitamin D metabolism Chemistry food and beverages Liter medicine.disease Milk medicine.anatomical_structure Endocrinology Food Fortified Dihydroxycholecalciferols Cattle Female Animal Science and Zoology Food Science |
| Zdroj: | Journal of Dairy Science. 68:1959-1967 |
| ISSN: | 0022-0302 |
| Popis: | To determine the effect of supplemental dietary vitamin D3 on concentration of vitamin D and its metabolites in milk, 20 Holstein cows were assigned to four groups and fed either 0, 10,000, 50,000, or 250,000 IU of vitamin D3/d beginning approximately 2 wk prepartum and continuing through wk 12 of lactation. Samples of blood plasma and milk were assayed for concentrations of vitamin D, 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D. Only the daily dosage of 250,000 IU caused significant increases of concentrations of vitamin D or 25-hydroxyvitamin D in plasma. Concentrations of vitamin D and 25-hydroxyvitamin D in milk were approximately equal and averaged .2 ng/ml. Little 1,25-dihydroxyvitamin D and no 24,25-dihydroxyvitamin D could be detected in milk from any of the four treatment groups. Cows fed 250,000 IU of vitamin D3/d produced milk containing 54 IU of vitamin D activity per liter, whereas unsupplemented cows produced milk containing 17 IU/L. Oral supplementation with up to 250,000 IU of vitamin D3/d does not increase effectively vitamin D activity of milk. |
| Databáze: | OpenAIRE |
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