Black soldier fly larvae study tests soybean meal replacement in broilers

A new broiler nutrition study adds fresh evidence that black soldier fly larvae meal could help replace soybean meal in poultry diets without automatically compromising bird performance or health. Published in Veterinary Sciences, the trial evaluated Ross 708 broilers fed diets in which black soldier fly larvae meal replaced soybean meal at 0%, 20%, 40%, or 60%, with researchers tracking growth, carcass traits, meat quality, and blood biochemical markers. (brill.com)

The work lands in the middle of a broader push to diversify poultry protein sources. Soybean meal remains a standard ingredient, but it carries cost, supply-chain, and sustainability pressures. Insect protein, especially from Hermetia illucens, has drawn attention because it can be produced on lower-footprint systems and has an amino acid profile that makes it a plausible feed ingredient for monogastric species. The Poultry Science Association has highlighted that AAFCO’s definition for dried black soldier fly larvae now includes poultry feed use, with the important caveat that the larvae must be raised on feed-grade materials. (poultryscience.org)

That regulatory context matters because it moves black soldier fly ingredients from a research concept toward a more practical formulation option. At the same time, the science remains nuanced. A 2023 systematic review and meta-analysis in Veterinary Sciences concluded that low levels of insect meal generally had similar effects on broiler growth performance as control diets, while also pointing to potential benefits in microbiota modulation and immune-related outcomes. But the same review noted that study designs vary widely, and that most broiler trials have tested inclusion levels in the roughly 5% to 15% range, not the much higher soybean meal replacement scenarios explored in some experimental studies. (mdpi.com)

That’s what makes the new paper notable. It focuses specifically on replacing soybean meal with black soldier fly larvae meal and evaluates not just weight gain and feed conversion, but carcass characteristics, meat quality, and blood chemistry. That broader endpoint set is important for veterinarians and poultry health teams, because alternative proteins can look acceptable on growth alone while still affecting metabolic markers, intestinal function, or downstream product quality. Prior broiler work has produced mixed signals: some studies suggest black soldier fly inclusion can support gut microbial balance and maintain performance, while others have reported poorer meat quality or weaker growth at higher substitution rates. (mdpi.com)

Industry and academic commentary around insect meal has been cautiously optimistic rather than celebratory. The Poultry Science Association’s interpretive summary described black soldier fly larvae as a promising high-protein, high-fat ingredient, but emphasized that nutrient composition can shift depending on the larvae’s feedstock. That variability is one reason nutritionists and veterinarians will likely view any single positive trial as informative, but not definitive. Formulation quality, digestibility, chitin content, amino acid balancing, and ingredient consistency all remain central questions before broad adoption. (poultryscience.org)

Why it matters: For veterinary professionals, this isn’t just a feed-cost story. Alternative proteins can influence flock health, litter quality, intestinal integrity, blood parameters, and meat outcomes, all of which affect production medicine decisions. If black soldier fly larvae meal can safely displace part of soybean meal, it could give integrators and nutrition teams another tool when soy markets tighten or sustainability targets become more prominent. But the available evidence still suggests moderation and formulation discipline matter, especially because higher inclusion rates have not been consistently neutral across studies. (mdpi.com)

There’s also a translational gap between controlled trials and commercial reality. Research settings can tightly manage diet composition, bird genetics, and environmental conditions. Commercial adoption will depend on ingredient price, supply reliability, processing standards, substrate compliance, and whether benefits hold in large, conventional broiler systems. In other words, black soldier fly meal is moving closer to being a practical ingredient, but it’s not yet a simple one-for-one soybean replacement story. (poultryscience.org)

What to watch: Expect the field to focus next on dose-response work, commercial-scale validation, and standardization, especially around nutrient consistency, gut health outcomes, and the economic case for replacing soybean meal in broiler programs. (poultryscience.org)