Rapid assessment of genotype-by-environment interactions and heritability for growth rate in aquaculture species using in vitro fertilisation and DNA tagging

Macbeth, G.M. & Wang, Y-G. (2014) Rapid assessment of genotype-by-environment interactions and heritability for growth rate in aquaculture species using in vitro fertilisation and DNA tagging. Aquaculture, 434, pp. 397-402.

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Abstract

Commercial environments may receive only a fraction of expected genetic gains for growth rate as predicted from the selection environment This fraction is the result of undesirable genotype-by-environment interactions (G x E) and measured by the genetic correlation (r(g)) of growth between environments. Rapid estimates of genetic correlation achieved in one generation are notoriously difficult to estimate with precision. A new design is proposed where genetic correlations can be estimated by utilising artificial mating from cryopreserved semen and unfertilised eggs stripped from a single female. We compare a traditional phenotype analysis of growth to a threshold model where only the largest fish are genotyped for sire identification. The threshold model was robust to differences in family mortality differing up to 30%. The design is unique as it negates potential re-ranking of families caused by an interaction between common maternal environmental effects and growing environment. The design is suitable for rapid assessment of G x E over one generation with a true 0.70 genetic correlation yielding standard errors as low as 0.07. Different design scenarios were tested for bias and accuracy with a range of heritability values, number of half-sib families created, number of progeny within each full-sib family, number of fish genotyped, number of fish stocked, differing family survival rates and at various simulated genetic correlation levels

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ID Code: 90425
Item Type: Journal Article
Refereed: Yes
Additional Information: ISI Document Delivery No.: AT6OM
Times Cited: 0
Cited Reference Count: 34
Macbeth, Gilbert Michael Wang, You-Gan
Department of Agriculture Fisheries and Forestry, Queensland Government, Australia
Funding was provided by the Department of Agriculture Fisheries and Forestry, Queensland Government, Australia.
Elsevier science bv
Amsterdam
Keywords: Growth rate, Genetic correlation, Genotype by environment, Heritability, Breeding design, trout oncorhynchus-mykiss, lates-calcarifer bloch, bass, dicentrarchus-labrax, rainbow-trout, fish-meal, oreochromis-niloticus, genetic-parameters, body-weight, barramundi, traits
DOI: 10.1016/j.aquaculture.2014.08.026
ISSN: 0044-8486
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved
Deposited On: 17 Nov 2015 06:50
Last Modified: 14 Jan 2016 05:40

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