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Amino acid requirements of neonate larvae of the black soldier fly, Hermetia illucens

Journal of Insects as Food and Feed
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C. Sandrock Research Institute of Organic Agriculture (FiBL), Livestock Sciences, Ackerstrasse 113, 5070 Frick, Switzerland

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https://orcid.org/0000-0002-2054-2216
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J. Wohlfahrt Research Institute of Organic Agriculture (FiBL), Livestock Sciences, Ackerstrasse 113, 5070 Frick, Switzerland

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T. Stadtlander Research Institute of Organic Agriculture (FiBL), Livestock Sciences, Ackerstrasse 113, 5070 Frick, Switzerland

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https://orcid.org/0000-0001-9342-1186
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F. Leiber Research Institute of Organic Agriculture (FiBL), Livestock Sciences, Ackerstrasse 113, 5070 Frick, Switzerland

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https://orcid.org/0000-0002-1434-6155
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F. Schindler Hermetia Baruth GmbH, An der Birkenpfuhlheide 10, 15837 Baruth/Mark, Germany

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https://orcid.org/0000-0002-3320-8284
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M. Hardick Agravis Raiffeisen AG, Industrieweg 10, 48155 Münster, Germany

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A. Lemme Evonik Operations GmbH, Rodenbacher Chaussee 4, 63457 Hanau-Wolfgang, Germany

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C. Lambertz Research Institute of Organic Agriculture (FiBL), Kasseler Strasse 1a, 60486 Frankfurt, Germany

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https://orcid.org/0000-0001-7786-4163
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Abstract

Amino acid (AA) requirements in black soldier fly larvae (BSFL) during the neonatal phase remain poorly investigated. A semi-artificial low-protein diet (NC, negative control, 14% protein) was compared to a poultry feed (PC, positive control, 18% protein) and a diet with 20 single AA added to NC to obtain a diet with 18% protein content simulating the AA profile of PC (RC, reference control). Additionally, 12 diets were formulated in which the six AAs Lys, Met, Thr, Arg, Ile and Trp were individually varied by either omitting or doubling respective contents, resulting in a reduction or excess of 31 to 46% relative to PC and RC (-AA and +AA treatments). In triplicate replication 10 000 neonates were reared for 10-14 days. Growth was most compromised in NC and -Lys. While -Met and -Trp growth was similar to PC, responses for -Arg, -Ile and -Thr were intermediate between PC and NC. Surplus levels of Met, Thr, Trp, and Ile did not, but of Lys and Arg improved performance compared with PC. Consequently, the fattening phase started 1–5 days earlier. Concluding, (i) Lys was first limiting in NC, (ii) Arg, Ile and Thr co-limited growth and (iii) Met and Trp did not limit growth. Striking responses of the indicator ‘age to target weight’ highlight the sensitivity of BSF neonates to differential AA provisions, with practical relevance for scaling up BSFL productions. Consequently, dietary AA supply considerably impacts economy of neonate production as a shortened production cycle would allow more production cycles per year.

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