The effect of distiller’s dried grains with solubles on carcass composition, fatty acid composition skin and fillet coloration of rain bow trout (oncorhynch us my kiss)

Abstract

The aim of The srudy Was to evaluate the effect of disliltoler’s dried ftra-in with solubles (DDGS) as:m alternative protein source on carcass composltlorjj forty add Oorn position, skirlP jnd filler. culoralion of iiI troul [OnccrhynCJTUS myfcissl Foui isopToteic (45.5% crude protein) and isocaloric (17.42 MJ/kg) diets were form u la Led -using DDG3 (0r 10. 20 and 30% for a feeding trill of 84 days. Fish (mean in ic La I weight of L 9.93 g] WCIE distrlbuied Into triplicate treatments at a rate of 25 fish per 200 L tanks and fed in satiation wiih die experimental diecs rhree rimes a day. The resulis of che present study ihow thai the coloration of experimental fish was not modified negatively by the use of DTXPS proicin sources In dicis. Cltca(fl composition values were also not alfe-tted by increased DDG5, although some fatty acids were affecied. Total saturated fatty acids, total mononnsaturated fatty acids, total n-3 polyunsaturated fatty acids (5n-3 PUFA) and En-3 PUFA/mtal n-G SOlvunsaLuru’-ud fatty adds (Zn-t PUFA) values of [he fish in [heepe rlmenra I roups were found TO heimnil. similar. On [he rufier hand.: i i-l i atldh docosahtatnolo acid and PUFA decreased, whilt linoleic acidr n- 6 PUFA and EPUFA Increawd significantly. In concluslonr the fatty acid composition oE fish muscle was affecied by the use- of DDCS up lo a rate ol 30% in rainbow irout diet, while nn negative efFect nn the skin and fills i cnloration could be fnnnd.