What are the disadvantages of black soldier fly?

Black soldier fly larvae (BSFL) have four main disadvantages: they require proper feeding rate limits, some flocks reject them initially, they cost more per ounce than dried mealworms, and they can be crushed or powdered during shipping.

As a treat supplement, black soldier fly larvae must stay within 5–10% of a hen's daily diet — exceeding that displaces the complete layer feed that provides everything BSFL can't. Neophobic hens sometimes ignore BSFL entirely for the first several days. Wild insectivores like bluebirds often reject the dried texture unless the grubs are rehydrated first. And while the calcium-per-gram value is high, the cost per bag is higher than comparable mealworm volumes.

• Recommended maximum feeding rate: black soldier fly larvae should not exceed 10% of a laying hen's daily diet.
• Flock rejection window: neophobic hens may refuse black soldier fly larvae for 3–7 days before accepting them.
• Wild bird limitation: bluebirds and some insectivores require black soldier fly larvae rehydrated in warm water for 15–30 minutes.
• BSFL do not replace free-choice oyster shell for heavy-production laying hens — they complement it.
• Black soldier fly larvae cost more per ounce than dried mealworms, though usable calcium per gram is roughly 85x higher.