Black soldier fly meal shows promise, limits in broiler diets
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A new study in Veterinary Sciences tested whether black soldier fly larvae meal could replace soybean meal in broiler diets without hurting growth, meat quality, or health markers. Researchers at Prairie View A&M University and collaborators fed 160 Ross 708 broilers diets in which black soldier fly larvae meal replaced soybean meal at 0%, 20%, 40%, or 60% on an equivalent basis. They found that lower replacement levels, especially 20%, supported growth performance and feed efficiency comparable to the control diet, while higher inclusion levels reduced body weight gain and worsened feed conversion. Carcass traits and most meat-quality measures were largely maintained, and blood biochemistry did not suggest major health disruption at the lower inclusion rates. That fits with other broiler work showing insect ingredients can be used safely at modest levels: in one Animals study, 2% or 4% full-fat Hermetia illucens or Tenebrio molitor meal did not affect growth, feed conversion, or mortality, and insect-fed birds had higher breast yield than controls, although some meat-quality and lipid-profile changes were noted depending on the insect source. (mdpi.com)
Why it matters: For veterinary professionals and poultry advisors, the paper adds to a growing body of evidence that insect protein may be a workable partial substitute for soybean meal, but not a simple one-for-one swap at high levels. That matters as poultry systems look for alternatives to soybean and fish meal because of price volatility, supply pressure, and sustainability concerns. The broader soybean-reduction story is also more complicated than just swapping ingredients: a separate broiler study found that a 10% reduction in soybean meal increased mortality, feed intake, and impaired fat utilization, while also shifting cecal microbiota toward more Campylobacterota and Helicobacter; raffinose supplementation partly moderated some of those changes but did not fully restore nutrient use. In other words, lowering soybean meal can create biological tradeoffs even before a replacement ingredient is considered. In the U.S., dried black soldier fly larvae now has an AAFCO ingredient definition for use in poultry feed, which makes the practical conversation less theoretical than it was a few years ago. (mdpi.com)
What to watch: Expect the next questions to center on optimal inclusion rates, amino acid balancing, fat content, cost, and whether commercial-scale formulations can reproduce these lower-level benefits consistently. Researchers will also be watching gut effects and threshold responses, since species-specific work in other animals has suggested that insect meal often has a “sweet spot” where performance is maintained and intestinal responses may even improve, but higher inclusion can start to erode those benefits. (mdpi.com)