Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/29035
Title: Should Angus Breeders Live-Animal Ultrasound Scan For Intramuscular Fat In The Genomics Era?
Contributor(s): Duff, C J  (author); van der Werf, J H J  (author)orcid ; Parnell, P F (author); Clark, S A  (author)orcid 
Publication Date: 2019
Open Access: Yes
Handle Link: https://hdl.handle.net/1959.11/29035
Open Access Link: http://www.aaabg.org/aaabghome/fullproc23.phpOpen Access Link
Abstract: Accuracy of selection and response to selection for the breeding objective traits of carcase IMF, AUS-MEAT marbling score and MSA marbling score were generated by modelling seventeen different phenotyping and genotyping scenarios using selection index theory. The data used in the study was produced from the Angus Sire Benchmarking Program (ASBP). The study showed that the highest rates of selection accuracy and response (ΔG) were achieved through using a combina-tion of ultrasound scan phenotyping for intramuscular fat (IMF) and genotyping with a reference population including carcase IMF and marbling score phenotypes. For phenotype only scenarios, Central Ultrasound Processing (CUP) showed substantially higher response to selection and accuracy of selection to the Esaote Aquila ultrasound system (PIE) for IMF resulting from the higher herita-bility and stronger genetic correlations to the direct carcase breeding objective traits. The value of ultrasound scan phenotyping diminishes as the prediction accuracy of the genomic breeding value (GBV) increases. The GBV only scenario surpassed phenotype only scenarios once GBV prediction accuracy was greater than 59% when compared to CUP IMF phenotyping and 46% when compared to the PIE IMF phenotyping.
Publication Type: Conference Publication
Conference Details: AAABG 2019: 23rd Conference of the Association for the Advancement of Animal Breeding and Genetics, Armidale, Australia, 27 October-1 November
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.23, p. 496-499
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
060412 Quantitative Genetics (incl. Disease and Trait Mapping Genetics)
060408 Genomics
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
310506 Gene mapping
310509 Genomics
Socio-Economic Objective (SEO) 2008: 830301 Beef Cattle
Socio-Economic Objective (SEO) 2020: 100401 Beef cattle
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
Publisher/associated links: http://www.aaabg.org/aaabghome/
Appears in Collections:Conference Publication
School of Environmental and Rural Science

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