Genet. Sel. Evol.
Volume 39, Number 4, July-August 2007
|Page(s)||431 - 446|
|Published online||06 July 2007|
Breeding salmonids for feed efficiency in current fishmeal and future plant-based diet environmentsCheryl D. Quintona, Antti Kausea, Juha Koskelab and Ossi Ritolac
a MTT Agrifood Research Finland, Biotechnology and Food Research, Biometrical Genetics, 31600 Jokioinen, Finland
b Finnish Game and Fisheries Research Institute Jyväskylä, Survontie 9, 40500 Jyväskylä, Finland
c Finnish Game and Fisheries Research Institute, Tervo Fisheries Research and Aquaculture, 72210 Tervo, Finland
(Received 9 November 2006; accepted 20 January 2007; published online 6 July 2007)
Abstract - The aquaculture industry is increasingly replacing fishmeal in feeds for carnivorous fish with soybean meal (SBM). This diet change presents a potential for genotype-environment (G E) interactions. We tested whether current salmonid breeding programmes that evaluate and select within fishmeal diets also improve growth and efficiency on potential future SBM diets. A total of 1680 European whitefish from 70 families were reared with either fishmeal- or SBM-based diets in a split-family design. Individual daily gain (DG), daily feed intake (DFI) and feed efficiency (FE) were recorded. Traits displayed only weak G E interactions as variances and heritabilities did not differ substantially between the diets, and cross-diet genetic correlations were near unity. In both diets, DFI exhibited moderate heritability and had very high genetic correlation with DG whereas FE had low heritability. Predicted genetic responses demonstrated that selection to increase DG and FE on the fishmeal diet lead to favourable responses on the SBM diet. Selection for FE based on an index including DG and DFI achieved at least double FE gain versus selection on DG alone. Therefore, current breeding programmes are improving the biological ability of salmonids to use novel plant-based diets, and aiding the aquaculture industry to reduce fishmeal use.
Key words: feed efficiency / genotype-environment interaction / selection / aquaculture / Coregonus lavaretus
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© INRA, EDP Sciences 2007