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Effects of enzyme supplementation to dehulled lupin-based diets on growth, feed efficiency, nutrient digestibility and carcass composition of rainbow trout, Oncorhynchus mykiss (Walbaum)

Citation

Farhangi, M and Carter, CG, Effects of enzyme supplementation to dehulled lupin-based diets on growth, feed efficiency, nutrient digestibility and carcass composition of rainbow trout, Oncorhynchus mykiss (Walbaum), Aquaculture Research, 38, (12) pp. 1274-1282. ISSN 1355-557X (2007) [Refereed Article]

DOI: doi:10.1111/j.1365-2109.2007.01789.x

Abstract

High inclusion levels of dehulled lupin (Lupinus angustifolius) in salmonid diets significantly decrease growth rates. This may be caused by the high concentrations of non-starch polysaccharides including oligosaccharide (OS) in lupin. The antinutritive effects of OS have not yet been fully investigated in fish. The objective of this study was to determine the effect of enzyme supplementation of dehulled lupin-based diets on the fish performance. There were two control diets: a fish meal-based diet with no plant protein (FM) and a diet that contained 50% dehulled lupin (L). Four experimental diets based on diet L and containing four different exogenous enzyme supplements were used: diet L(E) (Energex™); diet L(B) (Bio-Feed™ Pro); diet L(α) (Alpha galactosidase™); and diet L(Mix), which contained all the enzymes. Fish were randomly stocked into tanks in duplicate groups of 38 fish, 16.58±0.169 (SE) g, and were fed twice a day for 6 weeks. The supplemented enzymes did not improve weight gain in fish fed lupin-based diets. However, mixed enzyme significantly improved Protein Efficiency Ratio (PER). Apparent digestibility of DM, CP and GE significantly improved in fish-fed L(E) diet. None of the supplemented enzymes affected digestive tract indices or carcass composition. Surprisingly, weight gain was significantly higher in fish-fed L(α), L(E) and L(Mix) diets as compared with FM diet. Feed intake was significantly higher in fish-fed L, L(α) and L(E) diets compared with the FM diet. It is concluded that storing of lupin kernel under a suitable condition may have partially hidden the positive effects of exogenous enzymes through activating the endogenous enzymes. © 2007 Blackwell Publishing Ltd.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Farhangi, M (Mr Mehrdad Farhangi)
Author:Carter, CG (Professor Chris Carter)
ID Code:48932
Year Published:2007
Web of Science® Times Cited:28
Deposited By:TAFI - Aquaculture
Deposited On:2007-08-01
Last Modified:2008-04-11
Downloads:0

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