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Title: Managing the rate of increase in average co-ancestry in a rolling front tree breeding strategy
Contributor(s): Kerr, R J (author); McRae, T A (author); Dutkowski, G W (author); Tier, Bruce  (author)
Publication Date: 2015
DOI: 10.1111/jbg.12157
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Abstract: In breeding forest trees, as for livestock, the goal is to capture as much genetic gain as possible for the breeding objective, while limiting longand short-term inbreeding. The Southern Tree Breeding Association STBA) is responsible for breeding Australia's two main commercial forest tree species and has adopted algorithms and methods commonly used in animal breeding to achieve this balance. Discrete generation breeding is the norm for most tree breeding programmes. However, the STBA uses an overlapping generation strategy, with a new stream of breeding initiated each year. A feature of the species bred by the STBA ('Pinus radiata' and 'Eucalyptus globulus') is the long interval (up to 7 years) between when an individual is mated and when its progeny is first assessed in field trials and performance data included in the national performance database. Mate selection methods must therefore recognize the large pool of unmeasured progeny generated over recent years of crossing. In addition, the substantial delay between when an individual is selected in a field trial and when it is clonally copied into a mating facility (breeding arboretum) means that selection and mating must occur as a two-step process. In this article, we describe modifications to preselection and mate selection algorithms that allow unmeasured progeny (juveniles) to be recognized. We also demonstrate that the addition of hypothetical new progeny to the juvenile pool is important for computing the increase in average co-ancestry in the population. Methods outlined in this article may have relevance to animal breeding programmes where between mating and progeny measurement, new rounds of mating are initiated.
Publication Type: Journal Article
Source of Publication: Journal of Animal Breeding and Genetics, 132(2), p. 109-120
Publisher: Wiley-Blackwell Verlag GmbH
Place of Publication: Germany
ISSN: 1439-0388
Fields of Research (FoR) 2008: 070507 Tree Improvement (Selection and Breeding)
Fields of Research (FoR) 2020: 300709 Tree improvement (incl. selection and breeding)
Socio-Economic Objective (SEO) 2008: 820199 Forestry not elsewhere classified
Socio-Economic Objective (SEO) 2020: 260299 Forestry not elsewhere classified
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Journal Article

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