The aim of the study was to evaluate the use of three by-products as growing substrates for Hermetia illucens (Black Soldier Fly (BSF)) larvae: okara, maize distiller, brewer's grains, and a control hen diet. The study focused on larval growth and bioconversion performance, production of methane by larvae and environmental burden of larvae production, using Life Cycle Assessment (LCA) on a lab scale. Chemical composition of substrates differed: okara had the highest crude protein and ether extract contents, while brewer's grains showed the highest fiber content. Larvae fed on a hen diet and maize distiller exhibited the highest final weights (2.29 and 1.97 g, respectively). Larvae grown on okara showed the highest indexes for waste reduction and efficiency of conversion of the ingested feed. The BSF larvae did not produce any detectable traces of CH4. LCA evaluation showed that larvae production on a hen diet resulted in the most impact for most of environmental categories, for the inclusion of soybean meal in the diet (for climate change, 5.79 kg CO2 eq/kg dry larvae). Feed production activities resulted in the main contributions to environmental impact. In order to compare the larvae production obtained on all substrates, an environmental impact was attributed to okara and brewer's grain through a substitution method, and, by this approach, the best sustainable product resulted from the larvae grown on the maize distiller.

Rearing of Hermetia Illucens on Different Organic By-Products : Influence on Growth, Waste Reduction, and Environmental Impact / L. Bava, C. Jucker, G. Gislon, D. Lupi, S. Savoldelli, M. Zucali, S. Colombini. - In: ANIMALS. - ISSN 2076-2615. - 9:6(2019), pp. 289.1-289.16. [10.3390/ani9060289]

Rearing of Hermetia Illucens on Different Organic By-Products : Influence on Growth, Waste Reduction, and Environmental Impact

L. Bava
Primo
Supervision
;
C. Jucker
Secondo
Methodology
;
G. Gislon
Formal Analysis
;
D. Lupi
Writing – Review & Editing
;
S. Savoldelli
Supervision
;
M.E. Zucali
Penultimo
Formal Analysis
;
S. Colombini
Ultimo
Funding Acquisition
2019

Abstract

The aim of the study was to evaluate the use of three by-products as growing substrates for Hermetia illucens (Black Soldier Fly (BSF)) larvae: okara, maize distiller, brewer's grains, and a control hen diet. The study focused on larval growth and bioconversion performance, production of methane by larvae and environmental burden of larvae production, using Life Cycle Assessment (LCA) on a lab scale. Chemical composition of substrates differed: okara had the highest crude protein and ether extract contents, while brewer's grains showed the highest fiber content. Larvae fed on a hen diet and maize distiller exhibited the highest final weights (2.29 and 1.97 g, respectively). Larvae grown on okara showed the highest indexes for waste reduction and efficiency of conversion of the ingested feed. The BSF larvae did not produce any detectable traces of CH4. LCA evaluation showed that larvae production on a hen diet resulted in the most impact for most of environmental categories, for the inclusion of soybean meal in the diet (for climate change, 5.79 kg CO2 eq/kg dry larvae). Feed production activities resulted in the main contributions to environmental impact. In order to compare the larvae production obtained on all substrates, an environmental impact was attributed to okara and brewer's grain through a substitution method, and, by this approach, the best sustainable product resulted from the larvae grown on the maize distiller.
LCA; animal feeding; bioconversion; black soldier fly; by-products; larval development
Settore AGR/18 - Nutrizione e Alimentazione Animale
Settore AGR/19 - Zootecnica Speciale
Settore AGR/11 - Entomologia Generale e Applicata
29-mag-2019
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/651266
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