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Title: Estimation of optimum polygenic and genomic weights in single-step genetic evaluation of carcass traits in Australian Angus beef cattle
Contributor(s): Samaraweera, A M  (author)orcid ; Torres-Vazquez, J A  (author)orcid ; Jeyaruban, M G  (author)orcid ; Johnston, D J  (author)orcid ; Boerner, V  (author)
Publication Date: 2021
Open Access: Yes
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Optimum polygenic and genomic weights enhance the accuracy of breeding value estimates in single-step genomic evaluations. This study estimated the contribution from marker information to total additive genetic variation referred as λ using an extended single-step model in a multi-trait variance component estimation based procedure using data for six Australian Angus carcase traits. The λ for these traits ranged from 0.54 (for carcass intramuscular fat) to 0.79 (for carcass eye muscle area). Heritabilities were similar between the pedigree only and the extended single-step multi-trait model when using the total genetic variance, and ranged from 0.37 (for carcass rib fat) to 0.53 (for carcass weight), suggesting that the single-step model did not explain more genetic variance than pedigree based models. Results suggest that the scalar λ in the current single-step routine evaluation could be replaced by an extended single-step model allowing for different proportions of the additive genetic co-variance explained by markers for all elements of the genetic co-variance matrix.

Publication Type: Conference Publication
Conference Details: AAABG 2021: 24th Conference of the Association for the Advancement of Animal Breeding and Genetics, Online Event, 2nd - 4th November, 2027
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.24, p. 345-348
Publisher: Association for the Advancement of Animal Breeding and Genetics (AAABG)
Place of Publication: Armidale, Australia
ISSN: 1328-3227
Fields of Research (FoR) 2020: 300301 Animal growth and development
Socio-Economic Objective (SEO) 2020: 100401 Beef cattle
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Description: Paper presented by Amali Samaraweera
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication

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