Please use this identifier to cite or link to this item:
https://hdl.handle.net/1959.11/23154
Title: | Weighting of genomic and pedigree relationships in single step evaluation of carcass traits in Australian sheep | Contributor(s): | McMillan, Aaron (author) ; Swan, Andrew (author) | Publication Date: | 2017 | Open Access: | Yes | Handle Link: | https://hdl.handle.net/1959.11/23154 | Open Access Link: | http://www.aaabg.org/aaabghome/fullproc22.php | Abstract: | An issue for implementation of single step genomic evaluations is how to weight genomic and pedigree relationships in modelling genetic co-variance. A weighting parameter lambda ranging between 0 and 1 can be used in the statistical model, with higher values corresponding to greater weighting of genomic information. We investigated appropriate values of lambda for a range of carcass traits in terminal sire sheep breeds, using the accuracy and bias of genomic prediction of breeding values as criteria. The accuracy generally increased with lambda, although the "optimal" value of lambda at the maximum accuracy varied widely, covering almost the entire range of possible values across traits. Accuracy typically approached an asymptote towards the optimal lambda, so a wide range of values could be used with minimal loss of prediction accuracy. The bias in Estimated Breeding Values (EBVs) increased with lambda, such that EBVs over-predicted phenotypic performance at high values of lambda. | Publication Type: | Conference Publication | Conference Details: | AAABG 2017: 22nd Conference of the Association for the Advancement of Animal Breeding and Genetics, Townsville, Australia, 2nd - 5th July, 2017 | Source of Publication: | Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.22, p. 557-560 | Publisher: | Association for the Advancement of Animal Breeding and Genetics (AAABG) | Place of Publication: | Armidale, Australia | ISSN: | 1328-3227 | Fields of Research (FoR) 2008: | 070201 Animal Breeding | Fields of Research (FoR) 2020: | 300305 Animal reproduction and breeding | Socio-Economic Objective (SEO) 2008: | 830310 Sheep - Meat 830311 Sheep - Wool |
Socio-Economic Objective (SEO) 2020: | 100412 Sheep for meat 100413 Sheep for wool |
Peer Reviewed: | Yes | HERDC Category Description: | E1 Refereed Scholarly Conference Publication | Publisher/associated links: | http://www.aaabg.org/aaabghome/ |
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Appears in Collections: | Animal Genetics and Breeding Unit (AGBU) Conference Publication |
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