Background: Date palm seeds, a common waste product from date palm cultivation, have the potential to be repurposed as a feed material for Tenebrio molitor larvae, commonly known as mealworms.&nbsp; 
 
Methods: This study investigates the feasibility of utilizing date palm seeds as a sustainable feed source for mealworm rearing. Different ratios of date palm seed (DS) powder to wheat bran (WB) were used in the feed: 100% DS, 75% DS/25% WB, 50% DS/50% WB and 25% DS/75% WB. These treatments were assessed for their effects on mealworm growth, survival, total protein and phenolic contents, comparing them to conventional feed sources. 
 
Result: The analysis revealed that DS 25 and WB 75 exhibited the highest concentration of phenolic compounds among the examined extracts, measuring 0.91 mg GA/g. Conversely, WB 100 displayed the highest protein concentration at 51.69 mg/g, while DS 75 and WB 25 exhibited the lowest concentration at 38.62 mg/g. The total larval survival rates varied across different dietary compositions, with mealworms fed on DS 25: WB 75 achieving the highest survival rate of 95.50&plusmn;0.95%. larvae fed with DS 25: WB 75 showed the highest weight gain compared to other dietary compositions, indicating optimal growth conditions for mealworm larvae in this ratio. Results indicate that date palm seeds can serve as a viable alternative feed material for Tenebrio molitor larvae, offering a sustainable solution for waste management in date palm farming while providing a nutritious feed source for insect rearing.

Recycling of Date Palm Seed Substrate: Utilisation as Feed Material for Tenebrio molitor Larvae (Coleoptera: Tenebrionidae)