Abstract
ABSTRACT We studied the effects of ultraviolet B (UVB) exposure or administration of dietary vitamin D3 on serum vitamin D3, serum 25-hydroxyvitamin D3 (25[OH]D), calcium, and phosphorus in juvenile black-throated monitor lizards (Varanus albigularis) deprived of all sources of vitamin D for 87 days. Deprivation resulted in significant decreases of circulating levels of 25(OH)D (25–35%), vitamin D3 (73–76%), calcium (6%), and phosphorus (16%). The half-life of circulating 25(OH)D during deprivation was estimated to be from 128–139 days. After deprivation, eight monitors were given a single dose of UVB from exposure for 10–20 minutes to a Spectroline UVB lamp. The dose resulted in an average of 14.2% conversion of provitamin D3 to previtamin D3 and photoproducts within in vitro models. When administered once every week for 92 days, the dose failed to significantly modify the decline of serum 25(OH)D; however, the decline of vitamin D3 seemed to level off. The overall effect of the UVB dosing was weak, and ...
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