The potential of soya oil industry products as oil

Authors: A Keramat Amirkolaie M Darvishy Shahkolaie S Karimzadeh M K Khalesi

Publish Date: 2013/11/29

Volume: 22, Issue: 3, Pages: 1093-1103

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Abstract

This study investigated the effects of different soya oil products on growth nutrient digestibility and fatty acid composition of muscle in rainbow trout The products’ ingredients were soap stock fat powder crude oil and refined soya oil as a control Four experimental diets were formulated by addition of 12  of each of the four ingredients to a basal diet Replacement of refined soya oil by the soya oil products did not influence growth performance until 8 weeks P  005 This replacement however reduced fat digestibility in rainbow trout 837 vs 733–798  P  005 Dietary inclusions of fat powder and crude oil led to larger values of protein digestibility than those of refined soya oil and soap stock P  005 The compositions of saturated and monounsaturated fatty acids of the muscle were similar but linoleic acid concentration LA 18 2n6 increased in fish muscle fed refined soya oil compared to the other diets 37 vs 30–31  P  005 Arachidonic acid ArA 20 4n6 concentration was higher P  005 in fish fed both fat powder and soap stock than those fed the other diets In conclusion refined soya oil can be replaced by soya oil products in rainbow trout diet with no negative impacts on the growth However fish fed on diet containing refined soya oil had higher concentration of LA and lower density of ArA It appears that rainbow trout is capable of digesting soya oil products though the digestibility rate reduced slightly with an increase in saturated fatty acid content

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