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Calcium Accumulation and Loss and Vitamin D3 Content of Feeder Black Field Crickets (Gryllus bimaculatus) Fed on a High Calcium Diet with and without UVB Irradiation

1
Royal Veterinary College, University of London, London NW1 0TU, UK
2
Department of Natural Science, Manchester Metropolitan University, Manchester M15 6BH, UK
3
Zoological Society of London, London NW1 4RY, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Steven Monfort
J. Zool. Bot. Gard. 2021, 2(3), 382-387; https://doi.org/10.3390/jzbg2030027
Received: 15 June 2021 / Revised: 14 July 2021 / Accepted: 14 July 2021 / Published: 16 July 2021
Calcium metabolism in insectivores may be perturbed by insufficient calcium or vitamin D3. Insects may be gut loaded to increase calcium content, and recent research shows that exposure to UVB radiation can increase the vitamin D3 content of some invertebrates. Typical gut loading protocols result in peak calcium content after 24–48 h, while existing evidence with UVB irradiation involves exposure periods of tens of days. We UVB-irradiated fasted black field crickets (Gryllus bimaculatus) while feeding them on high calcium diets for 48 h, then fasted them for a further 24 h, and measured the vitamin D3, calcium, and phosphorus content compared with non-irradiated controls. UVB irradiation had no effect on vitamin D3 (crickets had no detectable levels of vitamin D3 at any point), or on calcium accumulation rates, which approximated existing research. Crickets significantly increased their calcium:phosphorus ratio from 0.17 to approximately 0.4 over 24 h and this did not increase over a further 24 h of feeding. Removal of the food source resulted in loss of all accumulated calcium within 24 h. Our results have implications for managing food sources for captive insectivores and highlight the importance of good feeder preparation and rapid consumption to ensure optimal calcium delivery to predators. View Full-Text
Keywords: calcium; metabolic bone disease; captive insectivores; vitamin D3; livefood; gut loading calcium; metabolic bone disease; captive insectivores; vitamin D3; livefood; gut loading
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MDPI and ACS Style

Bah-Nelson, I.; Newton-Youens, J.; Ferguson, A.; Michaels, C.J. Calcium Accumulation and Loss and Vitamin D3 Content of Feeder Black Field Crickets (Gryllus bimaculatus) Fed on a High Calcium Diet with and without UVB Irradiation. J. Zool. Bot. Gard. 2021, 2, 382-387. https://doi.org/10.3390/jzbg2030027

AMA Style

Bah-Nelson I, Newton-Youens J, Ferguson A, Michaels CJ. Calcium Accumulation and Loss and Vitamin D3 Content of Feeder Black Field Crickets (Gryllus bimaculatus) Fed on a High Calcium Diet with and without UVB Irradiation. Journal of Zoological and Botanical Gardens. 2021; 2(3):382-387. https://doi.org/10.3390/jzbg2030027

Chicago/Turabian Style

Bah-Nelson, India, Jade Newton-Youens, Amanda Ferguson, and Christopher J. Michaels 2021. "Calcium Accumulation and Loss and Vitamin D3 Content of Feeder Black Field Crickets (Gryllus bimaculatus) Fed on a High Calcium Diet with and without UVB Irradiation" Journal of Zoological and Botanical Gardens 2, no. 3: 382-387. https://doi.org/10.3390/jzbg2030027

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