Black soldier fly meal shows promise as partial soy replacement
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A new study in Veterinary Sciences suggests black soldier fly larvae meal could replace a meaningful share of soybean meal in broiler diets, but not without limits. In the trial, 160 Ross 708 chicks were assigned to diets in which black soldier fly larvae meal replaced 0%, 20%, 40%, or 60% of soybean meal on an equivalent basis. The researchers reported that moderate inclusion supported acceptable growth, carcass traits, meat quality, and blood biochemical measures, while higher replacement levels were more likely to pressure performance. That fits a broader pattern in the literature: one broiler study in Animals found 2% to 4% full-fat insect meal from either Hermetia illucens or Tenebrio molitor did not harm growth, feed conversion, mortality, or overall carcass quality, and even increased breast yield, though some meat-quality and lipid-profile shifts were noted at specific inclusion levels. A recent meta-analysis likewise suggested black soldier fly inclusion appears safest at relatively modest levels, reinforcing the idea that low-to-moderate use is more predictable than aggressive substitution. (mdpi.com)
Why it matters: For veterinary professionals working with poultry systems, the study is another sign that insect-derived proteins are moving from concept toward practical ration formulation, especially where feed cost, soy dependence, or sustainability targets are under pressure. But the takeaway isn't that black soldier fly meal is a simple one-for-one swap. Nutrient composition can vary by production method and harvest timing, and digestibility, fat content, chitin load, and ingredient consistency still matter in flock health and performance outcomes. More broadly, reducing soybean meal itself can have biological consequences if diets are not carefully reformulated: in one broiler study, a 10% soybean meal reduction increased mortality, feed intake, and impaired nutrient utilization, while also shifting cecal microbiota toward more Helicobacter and Campylobacterota. Regulatory context matters, too: in the U.S., AAFCO’s ingredient listings now include dried black soldier fly larvae for poultry and swine feed, while FDA has shifted to a post-MOU framework that includes enforcement discretion for 2024 AAFCO-defined ingredients and its newer Animal Food Ingredient Consultation pathway for future ingredients. (aafco.org)
What to watch: Expect the next phase of work to focus less on whether black soldier fly meal can be used in broilers, and more on optimal inclusion rates, ingredient standardization, economics, and how regulators and feed formulators handle newer insect-derived products. Cross-species work is pointing in the same direction: in fish, partially defatted black soldier fly meal appeared to have a threshold effect, with about 10% looking optimal for gut health while higher levels worsened intestinal condition; and in piglets, live mealworm larvae improved early feed efficiency, growth, and health status, suggesting insect-based ingredients may have functional value beyond simple protein replacement. (publish.csiro.au)