Black Soldier Fly Larvae for Chickens: DIY Feed and Bins

Quick answer: Using black soldier fly larvae for chickens provides an exceptional, homegrown source of 40% crude protein and high dietary calcium that strengthens eggshells and boosts flock vitality. By building a simple compost bin with a 35-degree climbing ramp, mature prepupae self-harvest directly into a collection bucket for effortless daily feeding.

Feeding backyard chickens a nutritious, balanced diet while managing household and garden waste is a central goal for many homesteaders. Commercial poultry feeds continue to rise in price, and standard grain rations often rely heavily on commercially imported soy and synthetic supplements.

Cultivating black soldier fly larvae (Hermetia illucens, commonly abbreviated as BSFL) offers a natural biological solution. These voracious grubs transform raw organic waste—including food scraps that standard worm bins cannot process—into plump, nutrient-dense live feed. For poultry keepers, BSFL represent one of the highest-quality natural protein and mineral supplements available.

By understanding the life cycle of the black soldier fly, building a self-harvesting DIY grub bin, and integrating live larvae into your flock's feeding schedule, you can cut feed costs and put household food waste to work. Yolk colour comes from greens and other carotenoid sources, not from the grubs.

```
+--------------------------------------------------------------------------+

+-------------------+-----------------------------+------------------------+

+-------------------+-----------------------------+------------------------+

+-------------------+-----------------------------+------------------------+
```

Why BSFL are the premier poultry supplement

While mealworms and crickets are popular chicken treats, black soldier fly larvae possess a distinct biological advantage: extraordinary natural calcium content.

Laying hens require substantial calcium to synthesize strong eggshells daily. When dietary calcium is deficient, hens draw calcium directly from their skeletal bones (the medullary bone), leading to osteoporosis, cage layer fatigue, and soft-shelled eggs.

Key nutritional benefits of BSFL for chickens:

• Calcium density: BSFL contain between 2.5% and 5.0% calcium by dry weight, roughly 50 to 100 times more than mealworms (which contain about 0.05% calcium and carry an inverted 1:7 calcium-to-phosphorus ratio).
• Lauric acid and antimicrobial fats: BSFL are rich in medium-chain fatty acids, especially lauric acid, which exhibits strong natural antimicrobial properties that promote healthy poultry gut microbiomes and suppress harmful gut pathogens like Salmonella.
• Feather growth and molt recovery: During autumn molting, hens cease laying to regenerate thousands of feathers, which are composed of 90% keratin protein. Feeding high-protein BSFL accelerates feather regrowth and shortens the non-productive molting window.

To explore foundational flock care strategies, see our comprehensive guide on backyard-chickens.

Understanding the Black Soldier Fly life cycle

Unlike houseflies or blowflies, adult black soldier flies are completely harmless and beneficial:

• No mouthparts: Adult soldier flies do not possess biting or chewing mouthparts; they do not eat, bite, or sting. They survive for only 5 to 8 days as adults on fat stores accumulated during the larval stage, living purely to mate and lay eggs.
• Adults are not feeding flies: Adult soldier flies do not feed, so they are not the nuisance or mechanical vector that houseflies and blowflies are. The larvae are a different matter — they carry the microbiology of whatever they are reared in, so substrate choice, not the adult fly, is what controls pathogen risk.
• Deterring pest flies: The presence of dense BSFL populations in a compost pile actively repels common houseflies through chemical pheromones and rapid waste consumption.

```
+--------------------------------------------------------------------------+

+--------------------------------------------------------------------------+

+--------------------------------------------------------------------------+
```

The critical behavioral trait for poultry keepers occurs at the prepupal stage. When the larva reaches full maturity, it turns from creamy-white to dark brown, empties its digestive tract, and develops a strong instinct to crawl out of the damp feeding zone toward a dry, elevated location to pupate. This behavior enables automated, zero-labor harvesting.

DIY self-harvesting bin construction

Building a self-harvesting bin harnesses the prepupae's natural crawling drive.

```
+--------------------------------------------------------------------------+

+--------------------------------------------------------------------------+

+--------------------------------------------------------------------------+
```

Required materials:

• Heavy-duty 18 to 30-gallon plastic storage tote or wooden chest.
• Smooth plastic sheet or PVC trim for internal ramps.
• Drainage bulkhead fitting and mesh screen (to collect excess liquid leachate).
• Corrugated cardboard strips suspended under the lid (for adult egg laying).
• Catch bucket positioned beneath the exit chute.

Assembly steps:

1. Construct the climbing ramps: Install smooth plastic ramps along the interior sidewalls angled at 35° to 40°. If the ramp is steeper than 45°, grubs cannot climb; if it is shallower than 30°, they take too long to exit.
2. Cut the exit chute: Drill a 1.5-inch exit hole at the top of each ramp, fitting a short PVC elbow that directs falling grubs into your exterior collection container.
3. Ensure drainage: Install a drainage tap at the lowest point of the bin floor, covered with 1/8-inch stainless mesh. Larvae breathe air; if standing liquid accumulates, the colony will drown.
4. Provide egg-laying cardboard: Bundle pieces of corrugated cardboard with rubber bands and suspend them under the lid, 2 inches above the food surface. Wild female flies land and lay egg clusters inside the cardboard flutes.

For detailed organic composting integration, read our guide on black-soldier-fly-composting.

Feeding and managing your larvae colony

Black soldier fly larvae are extraordinary omnivores capable of consuming a wide variety of organic waste:

• Feedstocks: If the larvae will be fed to poultry, rear them only on feed-grade plant material — vegetable and fruit trimmings, spent grain, bran, stale bread, coffee grounds. Do not use meat, fish, dairy, post-consumer plate scrapings or any manure. BSFL take on the microbiology of what they are reared in, Salmonella can persist in the larvae, and your eggs are the end of that chain. This is also the substrate limit under the AAFCO/FDA ingredient definition for BSFL in poultry feed.
• Materials to avoid: Large quantities of citrus peels (limonene inhibits growth), raw onions, tough woody branches, and pet feces.
• Moisture balance: Maintain feed moisture around 60% to 70% (similar to a wrung-out sponge). If the bin becomes too wet, mix in dry wheat bran, shredded cardboard, or sawdust.
• Temperature parameters: Optimal feeding occurs between 75°F and 95°F (24°C to 35°C). Below 60°F (15°C), larval metabolism slows dramatically. In cold-climate regions, colonies naturally go dormant in winter unless housed in a heated greenhouse or utility room.

When planning broader homestead economics alongside animal systems, consult our guide on how-much-does-it-cost-to-start-a-homestead.

Daily feeding rations and storage for chickens

While chickens adore live grubs, BSFL should be offered as a high-value supplement rather than an exclusive feed replacement.

Recommended feeding guidelines:

• Portion size: Offer up to about 2 tablespoons of live larvae per hen per day, or roughly a third of that volume when dried, and keep all treats together under 10% of daily intake.
• Feeding method: Scatter live larvae directly into run bedding or pasture to encourage natural scratching and foraging behavior. Learn more about pasture-based integration in our guide on food-forest-for-chickens.
• Preserving for winter storage: During peak summer production, blanch harvested larvae in boiling water for 40 to 60 seconds (or freeze them) before drying in a food dehydrator or low oven. Dehydrating alone is not a pathogen kill step. Because dried larvae contain 30% to 35% fat, store them in a cool, dark, airtight container and use within a few months to avoid rancidity.

For comprehensive egg production strategies, read our specialist resource on raising-chickens-for-eggs.