The digestibilities of nutrients in fed residue and excreta of silkworm were determined using three wethers. Mixed manure of autumm silkworm was separated into two categories, ie., a) feed residue which contained 5% of rice hull and b) excreta of silkworm which contained 9% of rice hull, 7% of fed residue, and 4% of soil and sand, and dried in a room. The feed residue of silkworm was fed to the wethers as the only feed and the excreta was fed with orchard grass hay. Total collection method was employed for the determination of digestibility and AOAC methods were adopted for chemical analysis. The results obtained were as follows: 1. Chemical compositions in fed residue and excreta of silkworm. $lt;표생략$gt; 2. Digestibility and digestible nutrients in feed residue and excreta of silkworm. $lt;표생략$gt;