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Title: Weighting of genomic and pedigree relationships in single step evaluation of carcass traits in Australian sheep
Contributor(s): McMillan, Aaron  (author)orcid ; Swan, Andrew  (author)orcid 
Publication Date: 2017
Open Access: Yes
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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: 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 Twenty-second (22nd) Conference of the Association for the Advancement of Animal Breeding and Genetics, v.22, p. 557-560
Publisher: AAABG: Association for the Advancement of Animal Breeding and Genetics
Place of Publication: Fitzroy, Australia
Field of Research (FoR) 2008: 070201 Animal Breeding
Field 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
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Series Name: Proceedings of the AAABG ... Conference
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Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
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