Abstract Background The Scarabaeidae insect Protaetia brevitarsis (PB) has recently gained increasing research interest as a resource insect because its larvae can effectively convert decaying organic matter to plant growth-promoting frass with a high humic acid content and produce healthy. nutritional insect protein sources. Lignocellulose is the main component of PB larvae (PBL) fee... https://www.ldartstudio.com/product-category/contours/