Black Soldier Fly Larvae in Animal Feed: what the evidence supports.

Why black soldier fly larvae are studied as feed

Black soldier fly larvae (Hermetia illucens) can convert suitable organic substrates into insect biomass containing protein, lipids and minerals. That ability has made BSFL meal a widely studied alternative ingredient for aquaculture, poultry, livestock and pet-food formulations.

The potential attraction is broader than protein alone. BSF systems can fit circular-resource models, while local or regional production may diversify feed-supply options. However, nutritional value, safety and commercial viability depend heavily on how larvae are raised and processed.

Nutritional composition is variable

Published reviews show that BSFL nutrient composition varies with rearing substrate, larval stage, processing and whether the meal is full-fat or defatted. Protein and fat values therefore should be taken from the specification of the actual finished ingredient rather than copied from a generic BSFL benchmark.

Can BSFL meal replace fishmeal or soybean meal?

Research supports partial replacement in many formulations, but the safe and effective level varies. Studies in aquaculture have reported good results at some replacement levels and poorer growth, digestive or physiological outcomes at higher levels in particular species. Poultry meta-analyses likewise show that some performance and quality indicators may improve while others show little or no benefit.

What determines a practical inclusion rate?

Aquaculture

BSFL meal has been studied extensively as a fishmeal alternative in aquaculture. The research is promising, but optimal replacement levels differ considerably by species, processing method and diet formulation. For example, some studies report good outcomes at modest replacement levels while higher substitution can affect feed intake, growth or intestinal condition.

This means a commercial aquafeed should be formulated against a specific fish or crustacean's nutrient requirements rather than using a general-purpose percentage.

Poultry

BSFL meal has also been tested in broilers and laying hens. Research suggests it can be a useful protein and fat source, and some studies report improvements in selected feed-efficiency or egg-quality parameters. However, it should not be marketed as a guaranteed way to increase body weight, laying rate, immunity or eggshell strength without product- and formulation-specific evidence.

Antimicrobial peptides, lauric acid and immune claims

BSF larvae contain biologically interesting compounds, including antimicrobial peptides, and their lipid fraction can contain substantial lauric acid depending on the rearing and processing system. These areas are actively researched for potential gut-health and antimicrobial effects.

But the presence of such compounds does not justify a blanket commercial claim that BSFL feed “prevents disease,” “replaces antibiotics” or “reduces mortality.” Those outcomes depend on dose, processing, species, pathogen challenge and the overall diet and husbandry environment.

Safety and quality control

A responsible insect-feed supply chain should address feedstock approval, traceability, microbial hygiene, contaminants, moisture, oxidation and storage. Saying that all dried BSFL are automatically free from pathogens or heavy metals is too broad. The finished ingredient should be supported by relevant testing and quality documentation.

Palatability and animal behaviour

Whole larvae or BSFL-based ingredients may be attractive to some animals, and insect-based diets have been studied for palatability and enrichment. Still, palatability is not universal. It can vary with species, inclusion rate, processing, flavour profile and the rest of the formulation.

Pet food and novel proteins

Insect protein is increasingly used as a novel protein source in pet food. That can be valuable in selected formulations, but “hypoallergenic” should not be treated as an automatic property of every insect ingredient or every pet diet. Any clinical or allergy-related positioning requires appropriately formulated products and supporting evidence.

Where BSFL fits into circular agriculture

BSF systems are attractive from a circular-economy perspective because suitable organic resources can be converted into insect biomass and frass. However, the environmental performance of a commercial system depends on feedstock source, energy use, transport, processing, substitution assumptions and what would otherwise have happened to the organic resource.

Terbit's longer-term Sustainable Protein pathway can build on this circular model, but quantified sustainability, feed-performance and commercial claims should only be introduced when the relevant production system and evidence exist.

Frequently asked questions

Can BSFL completely replace fishmeal?

Sometimes high replacement levels are possible in particular experimental diets, but there is no universal safe replacement rate for all aquatic species. Formulation and species-specific evidence are required.

Can BSFL replace soybean meal in poultry?

BSFL meal can replace part of conventional protein and fat sources in some poultry diets, but nutrient balance, ingredient cost and target performance determine the appropriate level.

Are BSFL automatically antibiotic alternatives?

No. Antimicrobial peptides and other compounds are scientifically interesting, but they do not justify a general disease-treatment or antibiotic-replacement claim.

Is Terbit selling insect protein today?

No current Terbit Sustainable Protein product is presented on Terbit Malaysia 2.0. Sustainable Protein remains a future development pathway while Organic Fertilizer is the current commercial priority.

References and further reading

1. Review: Nutritional composition of black soldier fly larvae and potential use as an alternative protein source in animal diets.
2. Meta-analysis: BSFL meal in laying-hen diets.
3. Aquaculture study: graded fishmeal replacement with defatted BSFL meal in tongue sole.
4. Critical review: BSFL as a protein feed resource in circular agriculture.