High-Calcium Feeders Compared: BSFL, Silkworms & Butterworms

Calcium deficiency (metabolic bone disease) is the most common nutritional disorder in captive reptiles. Choosing high-calcium feeders is one of the most impactful decisions a keeper can make. Here’s how they compare.

Rankings

Rank Feeder Score Notes
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Verdict

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Our VerdictBSFL are the undisputed calcium champion with 934mg/100g. Silkworms and earthworms offer the best natural Ca:P balance without needing supplementation. For MBD prevention, these three feeders should form the core of any insectivore’s diet.

References

  • Finke, M.D. (2002). “Complete nutrient composition of commercially raised invertebrates.” Zoo Biology, 21(3), 269–285.
  • Oonincx, D.G.A.B. & Dierenfeld, E.S. (2012). “An investigation into the chemical composition of alternative invertebrate prey.” Zoo Biology, 31(1), 40–54.

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