De invloed van D-vitamine en ultra-violette bestraling bij verschillende verhoudingen van Ca:P in het dieet
Two series of experiments with, respectively, 72(32♂ and 40♀) and 36 (all♀) spotted rats examined the influence of UV radiation and vitamin D on Ca and P metabolism. The experiments started at weaning of the rats (21-28 days) and lasted for 7 weeks in the first and for 5 weeks in the second series. Rations were used with Ca:P ratios varying between 1:045 and 1:2.8. Growth curves, skeletal X-ray photographs and Ca and P balances were studied.Ca: P ratios between 1: 0.96 and 1: 1.27 proved optimum. Net absorption and retention of these minerals was maximum at that ratio. The rations with extreme Ca: P ratios induced rachitis that healed with both treatments. It was in these rations that net absorption of Ca reacted most sensitively to vitamin D or UV treatment. At all Ca: P ratios some reaction was observed with vitamin D and with UV-treatment. Excess of one of the two minerals inhibited the retention of the other. Inhibition by Ca was more potent than by P.
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| Format: | Doctoral thesis biblioteca |
| Language: | Dutch |
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Veenman
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| Subjects: | anabolism, arsenic, biochemistry, body composition, chemical analysis, chemistry, ecotoxicology, environmental degradation, exposure, kinetics, metabolism, phosphorus, physiology, vitamin d, zootechny, anabolisme, arsenicum, biochemie, blootstelling, chemie, chemische analyse, ecotoxicologie, fosfor, fysiologie, kinetica, lichaamssamenstelling, metabolisme, milieuafbraak, vitamine d, zoötechniek, |
| Online Access: | https://research.wur.nl/en/publications/de-invloed-van-d-vitamine-en-ultra-violette-bestraling-bij-versch |
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