Vitamin D: Photobiological and Ecological Aspects

Björn, Lars Olof

doi:10.1007/978-0-387-72655-7_20

Cited by 3 publications

(3 citation statements)

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“…In humans, and possibly other vertebrates, 25(OH)D 3 is also taken into the cells of many other organs possessing vitamin D 3 receptors, including the immune system, where intracellular conversion to 1,25(OH) 2 D 3 takes place (Hossein‐nezhad & Holick, ). Within the cells, 1,25(OH) 2 D 3 has paracrine and autocrine functions (Björn, ).…”

Section: Introductionmentioning

confidence: 99%

“…Vitamin D 3 is utilized by almost all vertebrate species studied (Björn, ), and the formation of vitamin D 3 via 7‐DHC photoconversion is an ancient process which has been conserved through evolution. Most vertebrates are able to utilize pre‐formed vitamin D 3 from the diet, which has enabled many species of reptiles to be maintained in captivity without UVb lighting but with dietary supplementation of vitamin D 3 .…”

Section: Introductionmentioning

confidence: 99%

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A comparison of UVb compact lamps in enabling cutaneous vitamin D synthesis in growing bearded dragons

Diehl

Baines²,

Heijboer

et al. 2017

Animal Physiology Nutrition

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The effect of exposure to different UVb compact lamps on the vitamin D status of growing bearded dragons (Pogona vitticeps) was studied. Forty-two newly hatched bearded dragons (<24 h old) were allocated to six treatment groups (n = 7 per group). Five groups were exposed to different UVb compact lamps for two hours per day, with a control group not exposed to UVb radiation. At 120 days of age, blood samples were obtained and concentrations of 25(OH)D , Ca, P and uric acid were determined. In addition, plasma 25(OH)D concentration was determined in free-living adult bearded dragons to provide a reference level. Only one treatment resulted in elevated levels of 25(OH)D compared to the control group (41.0 ± 12.85 vs. 2.0 ± 0.0 nmol/L). All UVb-exposed groups had low 25(OH)D plasma levels compared to earlier studies on captive bearded dragons as well as in comparison with the free-living adult bearded dragons (409 ± 56 nmol/L). Spectral analysis indicated that all treatment lamps emitted UVb wavelengths effective for some cutaneous vitamin D synthesis. None of these lamps, under this regime, appeared to have provided a sufficient UVb dose to enable synthesis of plasma 25(OH)D levels similar to those of free-living bearded dragons in their native habitat.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comparison of UVb compact lamps in enabling cutaneous vitamin D synthesis in growing bearded dragons

Diehl

Baines²,

Heijboer

et al. 2017

Animal Physiology Nutrition

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“…On the other hand, it is well established that fowl can use UV absorbed by the head and legs to improve their vitamin D and calcium status and egg production (Bjorn, 2015). Sunlight influences conversion of provitamin D 3 ultimately to vitamin D 3 in featherless skin parts of birds (St. Lezin, 1983).…”

Section: Introductionmentioning

confidence: 99%

Influence of Sunlight Exposure on Total Serum Calcium and Inorganic Phosphate Level in Bank Myna, Acridotheres Ginginianus (Latham)

Bose,

Singh

2017

The Scientific Temper

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In birds, sunlight exposure to non-feathered skin areas including the leg helps in synthesis of vitamin D3 and thus calcium regulation. Gradual rise in total serum calcium had been recorded in Bank Myna in response to increasing duration of sunlight exposure with a maximum of 15.13+ 0.146mg/ dl in June. Incongruously, the experimental Bank Myna without direct sunlight exposure did not displayed marked rise in serum calcium level. In Bank Myna with natural day length sunlight exposure, higher values of serumPi had been recorded in breeding peak (June).

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