Digestibility and Palatability of Processed Forms of Carinata and Camelina Seedmeals

Carinata and camelina crop production is being promoted in the upper Midwest to provide oil for jet biofuel. The byproduct meals derived from de-oiled carinata and camelina seedmeals (SM) are high in protein and have potential as aquaculture feed ingredients. However, their inclusion levels in fish feeds are limited by breakdown products of glucosinolates (GLS) which reduce palatability and nutrient utilization. The GLS content of cold pressed (CP) carinata and camelina SM (23.7 and 24.9 µmol/g of SM, respectively) are at or above the tolerance limits of many fish species (1.4-11.6 µmol/g of feed). To improve feed potential, CP carinata and camelina SM were subjected to solvent extraction (SE) and extrusion (EX) or a processing combination. Each SM treatment was further processed by fermentation (FERM), providing 8 treatments. Processed meals were tested for palatability and; energy and protein digestibility in Rainbow Trout. Fermentation reduced the GLS content in carinata and camelina SM by greater than 70 and 97%, respectively. SE and FERM processing generally improved energy and protein digestibility; carinata SM ingredients were digested better than camelina SM. Both SE and FERM improved palatability more in carinata than for camelina products.