This study evaluated the effects of including low percentages (1.25%, 2.5% and 3.75%) of black soldier fly (Hermetia illucens L.) larvae (BSFL) and prepupae (BSFP) meal in the diet of old laying hens (100–115 weeks), assessing production, egg quality, metabolic/physiological traits, sensory attributes and economic outcomes. The 252 Lohmann LSL-Classic hens were assigned to seven groups in a completely randomised design. The 3.75% BSFP group improved feed conversion ratio (FCR), while egg production index (EPI) tended to be higher versus control; feed intake, survival and body weight were not adversely affected. External shell traits (e.g. shell weight and SWUSA) were higher in BSF groups, particularly with 3.75% BSFL whereas internal quality (Haugh units, yolk index) was maintained. Sensory evaluation showed no differences among groups. Serum protein fractions were modulated without detrimental changes in hepatic/renal indices. Economically, BSF diets reduced feeding costs and improved efficiency versus control. Overall, BSFL/BSFP up to 3.75% may represent a promising low-level alternative to soybean meal in aged layers, supporting a more circular and sustainable supply chain.
Attia et al. (Wed,) studied this question.