Sammendrag
Barley protein concentrate (BPC), a by-product from ethanol production, is a promising protein source for aquaculture feeds mainly due to its high protein content (~55%). Organic acids salts have been reported to promote growth and health performance in warm-blooded monogastric animals due to its antimicrobial effects. Previous studies with Atlantic salmon (Salmo salar) have shown that addition of formic acid salt to a plant-based diet improved protein digestibility. Furthermore, interactive effects of heat treatment and formic acid salt supplementation on amino acid digestibility have been observed. The objective of this experiment was to investigate the effect of sodium diformate (Na-diformate) and increasing extruder temperatures on nutrient digestibility in rainbow trout (Oncorhynchus mykiss) fed BPC-based diets. Triplicate groups of fish were fed a plant-based diet with 270 g kg-1 of BPC, with or without 10.6 g kg-1 Na-diformate. The diets were extruded at 110, 126, and 141ºC in a twin screw extruder, resulting in a total of six diets. Apparent digestibility coefficients (ADCs) of nutrients were determined by faecal stripping using yttrium oxide as an inert marker. ADCs of essential amino acids ranged from 82.5 to 92%, which is high. Increasing extruder temperatures resulted in a significant linear increase in ADCs of crude protein (P
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