Insect Feed for Livestock: Welfare in a New Production Chain

Insect-based protein feeds are increasingly proposed as a sustainable alternative to soy in livestock diets, but this shift creates new welfare questions about the billions of insects farmed in these supply chains.

Key Facts

Black soldier fly larvae (BSFL) and mealworms are the primary insect species farmed for animal feed, with global production expanding rapidly
A single insect protein facility may process tens of millions of larvae daily — making this potentially one of the largest-scale animal uses globally by number
The question of whether insects are sentient — capable of experiencing pain or suffering — is genuinely uncertain and actively debated in scientific literature
Black soldier fly larvae have simple nervous systems with approximately one million neurons; they possess nociceptors and show avoidance responses to harmful stimuli
Current industrial insect farming typically ends with heat treatment — blanching or roasting — that may or may not cause suffering depending on the resolution of sentience questions
Some insect welfare researchers argue that the sheer scale of insect farming justifies precautionary welfare measures even under uncertainty
Transition from soy-based to insect-based feeds could reduce land use and habitat destruction affecting vertebrate wildlife welfare at landscape scale

Welfare Considerations

Insect feed production forces a confrontation with welfare under genuine scientific uncertainty. If black soldier fly larvae are not sentient — if they lack the subjective experience of suffering — then their farming at enormous scale raises no direct welfare concern. If they are sentient, then the scale of current and projected production dwarfs all other farmed animal use combined. The honest answer is that we do not yet know with confidence, and the evidence suggests the question deserves to be taken seriously rather than dismissed on grounds of phylogenetic distance from vertebrates. The precautionary welfare principle applied to insects suggests that minimising suffering-risk — through rapid chilling before processing, optimal rearing conditions, and continued research — is warranted even without certainty.

What You Can Do

Engage with the scientific literature on insect sentience with genuine openness rather than assuming the answer
Support research into insect welfare and consciousness — funding in this area is severely underpowered relative to its potential importance
Advocate for precautionary welfare standards in insect farming even under uncertainty
Recognise the genuine trade-off: insect feed may reduce land use and wildlife habitat loss, benefiting vertebrate animals at landscape scale
Support organisations working on invertebrate welfare science including the Insect Welfare Research Society
When evaluating sustainable food system transitions, consider insect welfare alongside other sustainability dimensions