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Journal of Animal Science and Technology
Korean Society of Animal Science and Technology

J Anim Sci Technol

pISSN: 2055-0391, eISSN: 2672-0191

DOI: https://doi.org/10.5187/jast.2023.e66

Article

Black soldier fly larvae were more digestible than adult flies, and nutrient digestibility in black soldier fly larva meal can be predicted using acid detergent fiber based on in vitro assays for pigs

Jongkeon Kim1, Kwanho Park2, Sang Ji3, Beob Kim1,*
1Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea.
2Industrial Insect and Sericulture Division, National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea.
3Department of Research Policy, Research Policy Bureau, Rural Development Administration, Jeonju 54875, Korea.
*Corresponding Author: Beob Gyun Kim, Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea, Republic of. E-mail: bgkim@konkuk.ac.kr.

© Copyright 2023 Korean Society of Animal Science and Technology. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Feb 13, 2023; Revised: Apr 12, 2023; Accepted: Jul 09, 2023

Published Online: Jul 10, 2023

Abstract

The objectives of the present study were to determine the nutrient digestibility of fish meal, defatted black soldier fly larvae (BSFL), and adult flies and to develop equations for estimating <italic>in vitro</italic> nutrient digestibility of BSFL for pigs. <italic>In vitro</italic> digestion procedures were employed to mimic the digestion and absorption of nutrients in the pig intestine. Correlation coefficients between chemical composition and <italic>in vitro</italic> nutrient digestibility of BSFL were calculated. In Exp. 1, <italic>in vitro</italic> ileal digestibility (IVID) of dry matter (DM) and crude protein (CP) and <italic>in vitro</italic> total tract digestibility (IVTTD) of DM and organic matter in defatted BSFL meal were less (<italic>p</italic> &lt; 0.05) than those in fish meal but were greater (<italic>p</italic> &lt; 0.05) than those in adult flies. In Exp. 2, CP concentrations in BSFL were negatively correlated with ether extract (r = −0.91) concentration but positively correlated with acid detergent fiber (ADF; r = 0.98) and chitin (r = 0.95) concentrations. Acid detergent fiber and chitin concentrations in BSFL were negatively correlated with IVID of DM (r = −0.98 and −0.88) and CP (r = −0.87 and −0.84) and IVTTD of DM (r = −1.00 and −0.94) and organic matter (r = −0.99 and −0.98). Prediction equations for <italic>in vitro</italic> nutrient digestibility of BSFL were developed: IVID of CP (%) = −0.95 × ADF (% DM) + 95 (r<sup>2</sup> = 0.75 and <italic>p</italic> = 0.058) and IVTTD of DM (%) = −2.09 × ADF + 113 (r<sup>2</sup> = 0.99 and <italic>p</italic> &lt; 0.001). The present <italic>in vitro</italic> experiments suggest that defatted BSFL meal was less digestible than fish meal but was more digestible than adult flies, and nutrient digestibility of BSFL can be predicted using ADF as an independent variable.

Keywords: Black soldier fly; Chemical composition; In vitro assays; Nutrient digestibility; Pigs