Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 420993
Title Genotype by production environment interaction in the GIFT strain of Nile tilapia (Oreochromis niloticus)
Author(s) Khaw, H.L.; Ponzonia, R.W.; Hamzah, A.; Abu-Bakara, K.R.; Bijma, P.
Source Aquaculture 326-329 (2012). - ISSN 0044-8486 - p. 53 - 60.
Department(s) Animal Breeding and Genetics
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) trout oncorhynchus-mykiss - genetic-parameters - body-weight - rainbow-trout - common carp - breed improvement - sexual-dimorphism - european races - growth traits - selection
Abstract Three discrete generations of GIFT fish (Nile tilapia strain, Oreochromis niloticus; a total of 10,065 fish with pedigree and phenotypic information) were tested in pond and cage culture environments to determine genotype by production environment interaction between both environments in Malaysia. Live weight (selected trait), standard length, body depth and width were recorded. A bivariate animal model was used to estimate variance and covariance components, whereby the homologous body traits in pond and cage environments were treated as genetically distinct traits. The heritabilities estimated for these body traits ranged from 0.19 to 0.40 in the pond environment, and from 0.23 to 0.34 in the cage environment. Across all traits the maternal common environmental effects ranged from 0.14 to 0.26 and were greater for the pond than for the cage environment. The genetic correlations between the pond and cage environments were 0.73 ± 0.09 for live weight, 0.81 ± 0.09 for standard length, 0.78 ± 0.10 for body depth, and 0.85 ± 0.13 for body width. Coupled with the total selection responses for live weight after two generations of selection, being 35% for the pond environment and 45% for the cage environment, we concluded that genotype by environment interaction for GIFT strain between pond and cage environments was not important. Hence, it would not be necessary to have two separate selective breeding programs for the GIFT strain in Malaysia. --------------------------------------------------------------------------------
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