How to model/predict the BSF larvae growth during production?

Exploring the relationship between nutrient input per larva (mg, kcal, kJ, protein, and lipid content) and final larval weight is a good starting point.

A growth model conducted by KieBling et al. (2023), explored BSF larval weight based on the substrate contents of crude lipid and protein. 54 BSF larval diets based on stepwise (10%) replacement in the chicken feed by 7 raw materials.

KieBling et al. (2023) modeled the final larval weight depending on dietary protein and lipid content (why there is no Carbohydrate?) from these 54 substrates.

The results show a sharp, linear decrease in larval weight gain at lower lipid levels.

Running 540 or even 5,400 substrate tests allows researchers to quantify this relationship in detail. For example, larval weight can be modeled as a function of protein and lipid levels. This approach enables accurate prediction of BSF larval yield based on input data such as feed amount, protein, and moisture content.

P.S. Regarding the lipid contents in the BSF substrate, people often concern the lipid might be related to higher amounts of free fat in the substrate, thus creating anaerobe and sticky conditions on the surface of the larvae. Lower lipid levels may impair larval surface respiration and limit growth.

While mid crude lipid content (10%) might be good for BSF production, e.g., reduce heat stress, hinder microbes’ activities and associated heat production.