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Optimised parent selection and minimum inbreeding mating in small aquaculture breeding schemes: a simulation study

Published online by Cambridge University Press:  06 July 2012

F. S. Hely ,
P. R. Amer ,
S. P. Walker  and
J. E. Symonds
F. S. Hely*
Affiliation:
AbacusBio Limited, 442 Moray Place, Dunedin 9058, New Zealand
P. R. Amer
Affiliation:
AbacusBio Limited, 442 Moray Place, Dunedin 9058, New Zealand
S. P. Walker
Affiliation:
National Institute of Water and Atmospheric Research (NIWA), Station Road, Ruakaka 0116, New Zealand
J. E. Symonds
Affiliation:
National Institute of Water and Atmospheric Research (NIWA), Station Road, Ruakaka 0116, New Zealand
*
†E-mail: [email protected]
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Abstract

The effectiveness of low cost breeding scheme designs for small aquaculture breeding programmes were assessed for their ability to achieve genetic gain while managing inbreeding using stochastic simulation. Individuals with trait data were simulated over 15 generations with selection on a single trait. Combinations of selection methods, mating strategies and genetic evaluation options were evaluated with and without the presence of common environmental effects. An Optimal Parent Selection (OPS) method using semi-definite programming was compared with a truncation selection (TS) method. OPS constrains the rate of inbreeding while maximising genetic gain. For either selection method, mating pairs were assigned from the selected parents by either random mating (RM) or Minimum Inbreeding Mating (MIM), which used integer programming to determine mating pairs. Offspring were simulated for each mating pair with equal numbers of offspring per pair and these offspring were the candidates for selection of parents of the next generation. Inbreeding and genetic gain for each generation were averaged over 25 replicates. Combined OPS and MIM led to a similar level of genetic gain to TS and RM, but inbreeding levels were around 75% lower than TS and RM after 15 generations. Results demonstrate that it would be possible to manage inbreeding over 15 generations within small breeding programmes comprised of 30 to 40 males and 30 to 40 females with the use of OPS and MIM. Selection on breeding values computed using Best Linear Unbiased Prediction (BLUP) with all individuals genotyped to obtain pedigree information resulted in an 11% increase in genetic merit and a 90% increase in the average inbreeding coefficient of progeny after 15 generations compared with selection on raw phenotype. Genetic evaluation strategies using BLUP wherein elite individuals by raw phenotype are genotyped to obtain parentage along with a range of different samples of remaining individuals did not increase genetic progress in comparison to selection on raw phenotype. When common environmental effects on full-sib families were simulated, performance of small breeding scheme designs was little affected. This was because the majority of selection must anyway be applied within family due to inbreeding constraints.

Keywords

aquaculturebreeding programmeinbreedingsimulation
Type
Breeding and genetics
Information
animal , Volume 7 , Issue 1 , January 2013 , pp. 1 - 10
Copyright
Copyright © The Animal Consortium 2012

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