Black soldier fly larvae meal shows promise, limits in broilers

A newly published Veterinary Sciences study is the latest test of whether black soldier fly larvae meal can realistically displace soybean meal in broiler diets without compromising production. The paper, published March 18, 2026, followed 160 Ross 708 broilers fed diets in which black soldier fly larvae meal replaced soybean meal at 0%, 20%, 40%, or 60%, with researchers assessing performance, carcass traits, meat quality, and blood biochemical markers. (mdpi.com)

The question has been building for years. Soybean meal remains a core poultry protein source, but pressure around feed costs, supply volatility, land use, and sustainability has pushed nutrition researchers toward alternative proteins, especially insect-derived ingredients. Black soldier fly has drawn particular interest because of its protein and fat profile, and because larvae can be produced within circular feed systems. Reviews of the poultry literature describe the ingredient as promising, but they also make clear that outcomes depend heavily on inclusion rate, processing, nutrient balance, and the substrate used to raise the larvae. (tandfonline.com)

That context matters because the evidence base is not uniformly positive. Earlier broiler work has shown that complete replacement of soybean meal with black soldier fly larvae meal can reduce growth performance and alter organ morphology, while other studies have suggested that lower inclusion levels can support acceptable performance, especially in starter phases or when diets are carefully balanced. A 2021 open-access broiler study found that replacing soybean meal protein with black soldier fly larvae meal above 50% significantly worsened carcass quality and sensory traits, while a 2022 MDPI study comparing a soybean meal diet with one based on defatted black soldier fly meal also highlighted the need for careful formulation rather than assuming one-for-one replacement. (sciencedirect.com)

The new paper fits squarely into that middle ground. Based on the study description, the authors were not just asking whether birds could grow on insect protein, but whether performance, meat quality, and health indicators would hold up as soy replacement increased. That framing is useful for veterinarians because blood chemistry and meat-quality endpoints can reveal costs that aren’t obvious from body weight alone. It also aligns with other recent work showing that black soldier fly ingredients can influence gut health, immune markers, microbiota, and intestinal morphology, for better or worse depending on dose and ingredient profile. The Poultry Science Association, summarizing related research on black soldier fly oil in broilers, noted that moderate replacement levels may preserve performance while higher levels can shift blood chemistry in less favorable ways. (mdpi.com)

From an industry and regulatory standpoint, insect meal is no longer a fringe topic. AAFCO’s ingredient definition for dried black soldier fly larvae covers use in salmonid, poultry, and swine feed, provided the larvae are raised on feed-grade materials and labeled appropriately. That’s a meaningful step for practical adoption in the U.S., but it also highlights one of the field’s biggest operational constraints: black soldier fly meal is not a uniform commodity in the way soybean meal is. Nutrient composition can vary by substrate and processing, and both researchers and regulators have pointed to the need to control for contaminants, including heavy metals and other residues, when larvae are raised on unsuitable materials. (aafco.org)

Why it matters: For veterinary professionals advising poultry systems, the takeaway isn’t simply that insect meal works or doesn’t work. It’s that black soldier fly larvae meal appears most credible today as a targeted formulation tool, not a universal soybean meal substitute. If inclusion rates climb too high without correcting for amino acid balance, fat profile, chitin content, mineral differences, and ingredient variability, flock performance and product quality may suffer. But if sourcing is controlled and diets are formulated precisely, insect protein may offer another option for producers trying to manage sustainability goals, ingredient risk, or regional feed constraints. (tandfonline.com)

What to watch: The next phase will likely focus on defining practical upper limits for inclusion, separating effects of full-fat versus defatted meals, and clarifying how processing and substrate quality affect digestibility, health markers, and consistency across commercial flocks. Expect more attention, too, on cost competitiveness and whether black soldier fly meal ultimately finds its place as a partial replacement in specialty formulations rather than a broad soy substitute. (brill.com)