Abstract |
A study was conducted to determine the impact of dietary P intake on vitamin D metabolism and incidence of parturient paresis in aged dairy cows. Thirty dairy cows (10/group) were fed one of three experimental diets for approximately 28 d precalving. Phosphorus intake was .7, 1, or 3 times daily maintenance requirement and Ca intake was three times daily maintenance requirement for all cows. There was a 20% incidence of parturient paresis in each group. Prepartum dietary P intake had no effect on precalving or calving plasma Ca concentrations. Cows fed the low P (.7 times) diet had higher plasma Ca at 3 and 5 d postcalving than did cows fed P at 1 or 3 times maintenance. Plasma phosphorus concentrations reflected dietary P intake. Dietary P intake had no effect on plasma Mg, free hydroxyproline, 1,25-dihydroxyvitamin D, or 24,25-dihydroxyvitamin D concentrations. The range in dietary P from .7 to 3 times maintenance requirement had no effect on the incidence of parturient paresis. However, it did appear to influence Ca homeostasis during the postpartum period as cows fed the low P diet had higher plasma calcium concentrations postcalving. This may be a result of the low P diet enhancing intestinal C absorption by a vitamin D-mediated transport mechanism.
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Authors | B A Barton, N A Jorgensen, H F DeLuca |
Journal | Journal of dairy science
(J Dairy Sci)
Vol. 70
Issue 6
Pg. 1186-91
(Jun 1987)
ISSN: 0022-0302 [Print] United States |
PMID | 3611474
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Vitamin D
- Phosphorus
- Calcium
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Topics |
- Aging
- Animals
- Calcium
(metabolism)
- Cattle
- Cattle Diseases
(etiology, metabolism)
- Female
- Homeostasis
(drug effects)
- Parturient Paresis
(etiology, metabolism)
- Phosphorus
(pharmacology)
- Pregnancy
- Pregnancy, Animal
(metabolism)
- Vitamin D
(metabolism)
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