De invloed van D-vitamine en ultra-violette bestraling bij verschillende verhoudingen van Ca:P in het dieet

B.J.B. Groeneveld

Research output: Thesisinternal PhD, WU

Abstract

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.
Original languageDutch
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • Grijns, G., Promotor, External person
Award date24 Jun 1932
Place of PublicationWageningen
Publisher
Publication statusPublished - 1932
Externally publishedYes

Keywords

  • zootechny
  • physiology
  • chemistry
  • metabolism
  • body composition
  • biochemistry
  • anabolism
  • phosphorus
  • vitamin d
  • arsenic
  • chemical analysis
  • exposure
  • environmental degradation
  • kinetics
  • ecotoxicology

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