Silkworm chrysalis meal (Bombyx mori L.) as an alternative protein source for broilers in an ecological-based system

This study evaluated silkworm chrysalis meal (Bombyx mori L.; SWCM) as a protein source to replace soybean meal in diets for slow-growing broilers, focusing on nutrient digestibility, performance, and economic feasibility. Conducted within an ecological-based production system under Brazilian regulations for free-range poultry, the study involved 111 Sasso Ruby N (XL44N) male broilers. The study was conducted in two stages: the first evaluated the digestibility of balanced diets; the second analyzed zootechnical performance and economic feasibility. SWCM showed high nutritional value, with 53.5% crude protein, 30.7% ether extract, and 6091 kcal/kg of gross energy. Inclusion of 70% SWCM (30% of the diet) provided the highest digestibility coefficient for crude protein without affecting the digestibility of dry matter, ether extract, or minerals. Performance trials revealed that replacing up to 50% of soybean meal with SWCM (13.76% of the diet) maintained similar growth performance to the control. Economic analysis indicated SWCM as a viable alternative, particularly for supplementing national protein demands through importation. These findings demonstrate the nutritional and economic potential of SWCM, supporting its inclusion as a sustainable protein source capable of replacing up to 50% of soybean meal in slow-growing broiler diets without compromising performance.