Abstract
BackgroundThe study aimed to determine the apparent total tract digestibility coefficients (ATTDC) of nutrients, the apparent metabolizable energy (AME and AMEn) and the amino acid (AA) apparent ileal digestibility coefficients (AIDC) of a partially defatted (BSFp) and a highly defatted (BSFh) black soldier fly larvae meal. The experimental diets were: a basal diet and two diets prepared by substituting 250 g/kg (w/w) of the basal diet with BSFp or BSFh, respectively.ResultsSignificant differences were found between BSFp and BSFh meals for ATTDC of the nutrients: BSFp resulted more digestible than BSFh, except for ATTDC of CP which did not differed between meals, while a statistical trend was observed for ATTDC of DM and EE. The AME and AMEn values were significantly (P < 0.05) different between the two BSF meals, with higher levels for BSFp (16.25 and 14.87 MJ/kg DM, respectively). The AIDC of the AA in BSFp ranged from 0.44 to 0.92, while in BSFh they ranged from 0.45 to 0.99. No significant differences were observed for the AA digestibility (0.77 and 0.80 for BSFp and BSFh, respectively), except for glutamic acid, proline and serine that were more digestible in the BSFh meal (P < 0.05).ConclusionsDefatted BSF meals can be considered as an excellent source of AME and digestible AA for broilers with a better efficient nutrient digestion. These considerations suggested the effective utilization of defatted BSF larvae meal in poultry feed formulation.
Highlights
The study aimed to determine the apparent total tract digestibility coefficients (ATTDC) of nutrients, the apparent metabolizable energy (AME and AMEn) and the amino acid (AA) apparent ileal digestibility coefficients (AIDC) of a partially defatted (BSFp) and a highly defatted (BSFh) black soldier fly larvae meal
Defatted BSF meals can be considered as an excellent source of Apparent metabolizable energy (AME) and digestible AA for broilers with a better efficient nutrient digestion
Significant differences were found between the two BSF meals for the ATTDC of Ether extract (EE) and Gross energy (GE) (P < 0.05), a statistical trend was observed for the ATTDC of Dry matter (DM) and organic matter (OM) (P < 0.10), while no significant difference was found for ATTDC of Crude protein (CP) (P = 0.834)
Summary
The study aimed to determine the apparent total tract digestibility coefficients (ATTDC) of nutrients, the apparent metabolizable energy (AME and AMEn) and the amino acid (AA) apparent ileal digestibility coefficients (AIDC) of a partially defatted (BSFp) and a highly defatted (BSFh) black soldier fly larvae meal. Nowadays knowledge about the suitability of the use of BSF as poultry feed ingredient is scarce and little-to-date At this regard, acceptability by animals, feed conversion rates, animal health issues and quality of the obtainable animal-derived food products are of particular interest and not yet investigated sufficiently [11]. That limitation consisted on this information is often obtained from a whole insect meal without separation of the fat fraction from the protein one As it is known, for an efficient and optimal broiler feed formulation the best situation is to manage fat and protein sources separately. For an efficient and optimal broiler feed formulation the best situation is to manage fat and protein sources separately For this purpose, and because insect farming is going to be a growing market, nowadays BSF manufacturers have started to produce defatted BSF meals. Henry et al [5] suggested the importance of defatting insect meals, using insect protein concentrate as animal feed ingredient and the lipids both for animal nutrition and the production of biodiesel [18, 19]
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