A Solid-State Fermentation (SSF) supplement improved performance, digestive function and gut ultrastructure of rainbow trout (Oncorhynchus mykiss) fed plant protein diets containing yellow lupin meal

A nutritional investigation was conducted to determine whether growth performance, feed efficiency and midgut morphology of rainbow trout ( Oncorhynchus mykiss ) is affected by United Kingdom cultivars Yellow Lupin (Control, Y) (LC) compared the addition a commercial solid-state fermentation product (SSF) in separate dietary treatments 0.1 0.5% (LS0.1 LS0.5, respectively). At end feeding trial, LC- LS0.1-fed fish did not differ from one another, whilst significant improvement observed LS0.5 fed P < 0.05). Apparent digestibility crude protein fibre were significantly higher LS0.1 than LC. No differences 0.05) Haemoglobin (Hb) concentrations among treatments. Fish 0.1% SSF inclusion exhibited 0.001) haematocrit (Hct) concentration all other Significantly 0.005) serum glucose levels FMC LC LS0.1, elevation also over LS0.1. Activity lysozyme 0.05 treatment LC, S0.1 groups. have reduction goblet cell counts (GC) those LS0.1.). Median enterocyte height (EH) another but both greater fish. Mean microvilli length (MVL), diameter (MVD) apical area (EAA) between > displayed microvillar percentage coverage (MVCV) Total alkaline protease (TAP), trypsin chymotrypsin activities digesta unaffected phosphatase (ALP) L-leucine aminopeptidase (LAP) marginally = 0.045) LAP • could effectively contribute 30% within balanced formulation for semi-purified high fishmeal diet. The especially Solid State Fermentation (Synergen™) increase performance lupin diets. coefficients major nutrients particularly retention increased showing better assimilation with SSF. There an some digestive enzyme more noticeably ALP (Alkaline Phosphatase) (Leucine Aminopeptidase). Serum Lysozyme activity SFF supplementation.