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)

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Effects of phytase pretreatment of soybean meal and phytase-sprayed in diets on growth, apparent digestibility coefficient and nutrient excretion of rainbow trout (Oncorhynchus mykiss Walbaum) (2009, background): “It has been demonstrated that the addition of phytase in the diet has the potential to improve the digestibility of nutrients and minerals (Cheng and Hardy 2003; Yoo et al. 2005), and the feed conversion efficiency and growth (Sajjadi and Carter 2004; Schafer et al.”
Expanding the utilization of sustainable plant products in aquafeeds: a review (2007, background): “The value of barley to rainbow trout is increased when the feed is manufactured by cooking extrusion (Cheng & Hardy 2003a).”
Application of microbial phytase in fish feed (2007, background): “Cheng and Hardy [66] reported that reported that availabilities of copper, phosphorus and zinc in barley, corn gluten meal and wheat-based rainbow trout feeds were significantly reduced after extrusion; this was due partially to the destruction of intrinsic phytase in feed ingredients by the high te”
Phytate in foods and significance for humans: food sources, intake, processing, bioavailability, protective role and analysis. (2009, unknown): “Similar observations were made in oilseeds, and soybean meal was least affected by extrusion cooking [311].”