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Di Girolamo, N., & Selleri, P. (2011). Variations of 25-hydroxyvitamin d3 in testudo hermanni exposed to different ultraviolet radiation sources. Proceedings of the Association of Reptile and Amphibian Veterinarians, 18, 107–108. 
Added by: Admin (06 Jan 2014 18:24:29 UTC)
Resource type: Journal Article
BibTeX citation key: Girolamo2011
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Categories: General
Keywords: Ernährung - nutrition, Schildkröten - turtles + tortoises, Testudinidae, Testudo hermanni, Untersuchungsmethoden - examination method, Veterinärmedizin - veterinary medicine
Creators: Di Girolamo, Selleri
Collection: Proceedings of the Association of Reptile and Amphibian Veterinarians
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Abstract     
Testudinidae Metabolic bone disease (MBD) is a common, polyetiologic pathology in terrestrial chelonians (McArthur, 2004; Fledelius et al., 2005). Insufficient cholecalciferol is considered an important factor in inducing MBD (Frye, 1997). Adequate plasma concentration of cholecalciferol depends upon husbandry and nutrition (Hoby et al., 2010; Oonincx et al., 2010). Assuming that dietary requirements are fulfilled, exposure to UV-B radiation is necessary to photolyze cutaneous provitamin D and to obtain an adequate plasmatic cholecalciferol concentration (Oonincx et al., 2010; Holick et al., 1995). Recent studies focused on 25- hydroxycholecalciferol (25-OHD3) status in various reptiles (Eatwell, 2008; Acierno et al., 2006; Acierno et al., 2008; Hoby et al., 2010; Karsten et al., 2009); however, the effect of different ultraviolet sources on the concentration of 25-OHD3 in terrestrial chelonians is still unclear. The objective of our study is to evaluate differences in plasma concentration of 25-OHD3 in Testudo hermanni exposed to different ultraviolet radiation sources. For this purpose 18 animals recently emerged from hibernation were randomly allocated in three groups. Group 1 (control) was kept in an outdoor enclosure and naturally exposed to sunlight. Temperatures and climatic conditions were recorded daily. Group 2 and 3 were housed indoor in two vivaria with constant temperature gradient and 12-hours photoperiod. Group 2 was exposed to a full-spectrum mercury vapor lamp. Group 3 was exposed to a high UV-B output compact fluorescent lamp plus an infrared bulb. All the animals were fed the same diet composed of wild grasses. The UV-B exposure of each group was recorded by use of a digital radiometer. The study was continued for a 5-week period. Blood samples were collected at the beginning and the end of the study for measurement of 25- OHD3 concentrations. Raw mean, Standard Deviation and statistical analysis of the data (One-Way ANOVA and t-test) were performed. The results of this study show the variations of 25-OHD3 in post-hibernating animals managed in different ways, suggesting which light source provides an higher plasma 25-OHD3 concentration in terrestrial chelonians.
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