Insects convert vegetable proteins that obtained from their food into animal protein inside of their body before accumulating nutrients. Insects are a promising candidate for animal feed ingredients because it can be efficiently utilized as good nutrients by livestock. molitor and to reduce the rearing period.

Based on this study, we concluded that adding BSG to wheat bran helps to improve the quality of T. Wheat bran with 30~50% of BSG was the optimal diet for successive insect rearing among the five diet treatments. Especially, the group with 30% of BSG showed highest pupation rate among the five groups. In all treatment groups, more than 90% of pupation rate were observed. For the developmental period, the groups with 30% of BSG took less time compared to the control group. For the larval weight, groups with 30% and 50% of BSG gained more weight than that with control treatment, 0% of BSG. The larval survivorships were almost similar with the control group except a group with 70% of BSG. We compared survivorship, larval weight, developmental duration, pupation rate, and pupal weight of five different groups of T. We prepared five different diets with various BSG content, 0, 10, 30, 50, and 70% of heated air dried BSG with wheat bran. In this study, we investigated the effects of brewer's spent grain (BSG) on the growth of mealworm larvae to reduce the rearing cost. Conventionally, mealworms raised on wheat bran. Mealworms, Tenebrio molitor (Coleoptera: Tenebrionidae), are widely used as food sourcefor animal rearing as well as human diet.

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