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Genetic gain of pure line selection and combined crossbred purebred selection with constrained inbreeding

Published online by Cambridge University Press:  18 August 2016

P. Bijma ,
J.A. Woolliams  and
J.A.M. van Arendonk
P. Bijma
Affiliation:
Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen University, 6700 AH Wageningen, The Netherlands
J.A. Woolliams
Affiliation:
Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS, UK
J.A.M. van Arendonk
Affiliation:
Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS, UK
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Abstract

Using deterministic methods, rates of genetic gain (Δ G) and inbreeding (Δ F) were compared between pure line selection (PLS) and combined crossbred purebred selection (CCPS), for the sire line of a three-way crossbreeding scheme. Purebred performance and crossbred performance were treated as genetically correlated traits assuming the infinitesimal model. Breeding schemes were compared at a fixed total number of purebred selection candidates, i.e. including crossbred information did not affect the size of the purebred nucleus. Selection was by truncation on estimated breeding values for crossbred performance. Rates of genetic gain were predicted using a pseudo-BLUP selection index. Rates of inbreeding were predicted using recently developed methods based on long-term genetic contributions. Results showed that changing from PLS to CCPS may increase ΔF by a factor of 2·14. In particular with high heritabilities and low purebred-crossbred genetic correlations, CCPS requires a larger number of parents than PLS, to avoid excessive ΔF. The superiority of CCPS over PLS was judged by comparing ΔG from both selection strategies at the same ΔF. At the same ΔF, CCPS was superior to PLS and the superiority of CCPS was only moderately reduced compared with the situation without a restriction on ΔF. This paper shows that the longterm genetic contribution theory can be used to balance ΔF and ΔG in animal breeding schemes within very limited computing time.

Keywords

crossbreedingeffective population sizegenetic gaininbreedingselection.
Type
Breeding and genetics
Information
Animal Science , Volume 72 , Issue 2 , April 2001 , pp. 225 - 232
Copyright
Copyright © British Society of Animal Science 2001

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