Aqueous fractionation improves the nutritional value of wheat distillers grains for rainbow trout (Oncorhynchus mykiss)

作者：Reveco F E; Collins S A; Randall K M; Drew M D^*

来源：Aquaculture Nutrition, 2012, 18(2): 202-210.

DOI：10.1111/j.1365-2095.2011.00889.x

• digestibility
• fractionation
• growth
• protein concentrate
• rainbow trout
• wheat distillers grains

Fractionation of wheat wet distillers grains (WWDG) was performed to reduce non-starch polysaccharides (NSP) and increase protein content. WWDG was collected from two ethanol plants, and protein was extracted by the addition of water, autoclaving to precipitate protein and drying in a forced air oven at 55 degrees C to create WWDGprotein concentrate (WWDGPC). This process increased crude protein (CP) and decreased NSP in the WWDGPC (P %26lt; 0.05). Dry matter and energy digestibility of WWDGPC in rainbow trout were increased by fractionation (P %26lt; 0.05). A 56-day growth trial was performed to determine the effect of feeding WWDGPC on growth performance of rainbow trout. Rainbow trout (n = 18/tank; body weight = 231 g; 3 tanks/treatment) were fed diets containing 0, 75, 150, 225 or 300 g kg-1 WWDGPC. All diets were formulated to contain 386 g kg-1 digestible CP and 17.6 MJ kg-1 digestible energy. There was no significant linear or quadratic relationship between inclusion rate and growth, feed intake or feed conversion, indicating that at inclusion levels of up to 300 g kg-1 of WDDGPC does not reduce the growth performance of rainbow trout.

• 出版日期2012-4