Effects of extrusion and expelling processing, and microbial phytase supplementation on apparent digestibility coefficients of nutrients in full-fat soybeans for rainbow trout (Oncorhynchus mykiss)

摘要

An experiment was conducted to evaluate the effects of extrusion and expelling processing, and microbial phytase supplementation on apparent digestibility coefficients (ADCs) of dry matter, crude protein (CP), amino acids, and minerals in full-fat soybeans (FFSB) for rainbow trout. Raw, extruded, and expelled soybeans were used. Microbial phytase (Natuphos 5000 l) was added to extruded soybeans at 200, 400, 600, 800, and 1000 FTU/kg diet, and to expelled soybeans at 200 FTU/kg diet. They were each mixed with a casein-gelatin reference diet at a 30:70 ratio to determine their respective ADCs.