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Oftedal, O. T., Chen, T. C. & Schulkin, J. (1997) Preliminary observations on the relationship of calcium ingestion to vitamin D status in the green iguana (Iguana iguana). Zoo Biology, 16 201–207. 
Resource type: Journal Article
DOI: 10.1002/(SICI)1098-2361(1997)16:3<201::AID-ZOO1>3.0.CO;2-E
BibTeX citation key: Oftedal1997
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Categories: Englisch = English
Keywords: Echsen = Lizards, Reptilien = Reptiles, Ultraviolett = Ultraviolet, Vitamin D = Vitamin D
Creators: Chen, Oftedal, Schulkin
Collection: Zoo Biology
Abstract
We hypothesized the vitamin D-deficient green iguanas with depleted calcium stores would seek to augment calcium intake by self-selection of a high calcium source. Eight green iguanas were offered free-choice ground oystershell in addition to their regular diet. Of these, two had not been exposed to ultraviolet (UV-B) radiation for > 5 years and were demonstrated to be vitamin D-deficient by low circulating levels of the principal vitamin D metabolite, calcidiol (25-hydroxy-cholecalciferol). The six others had been exposed to a UV-B emitting bulb for the previous 3 years and had high circulating calcidiol levels. Average daily food intake (expressed as dry matter per kg body mass) did not differ between the Low-D and High-D iguanas. The daily oystershell intake of the Low-D iguanas (0.02-0.03 g/kg) was lower than that of the High-D iguanas (0.06-0.70 g/kg), leading to a significant difference in calcium intake. The failure of iguanas to increase calcium intake in response to vitamin D-deficiency was puzzling and suggests that vitamin D, as a steroid hormone, may play some role in the expression of calcium appetite. Zoo Biol 16:201-207, 1997. © 1997 Wiley-Liss, Inc.

Keywords
food selection • minerals • vitamin D deficiency • reptiles
  
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