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RESEARCH ARTICLE (Open Access)

On the value of adding commercial data into the reference population of the Angus SteerSELECT genomic tool

Antonio Reverter https://orcid.org/0000-0002-4681-9404 A * , Laercio Porto-Neto A , Brad C. Hine https://orcid.org/0000-0001-5037-4703 B , Pamela A. Alexandre A , Malshani Samaraweera C , Andrew I. Byrne C , Aaron B. Ingham A and Christian J. Duff https://orcid.org/0000-0002-3072-1736 C
+ Author Affiliations
- Author Affiliations

A CSIRO Agriculture and Food, Queensland Bioscience Precinct, 306 Carmody Road, St Lucia, Brisbane, Qld 4067, Australia.

B CSIRO Agriculture and Food, F.D. McMaster Laboratory, Chiswick, New England Highway, Armidale, NSW 2350, Australia.

C Angus Australia, 86 Glen Innes Road, Armidale, NSW 2350, Australia.

* Correspondence to: toni.reverter-gomez@csiro.au

Handling Editor: Sue Hatcher

Animal Production Science 63(11) 947-956 https://doi.org/10.1071/AN22452
Submitted: 13 December 2022  Accepted: 20 February 2023   Published: 14 March 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context: Angus SteerSELECT is a genomic tool designed to provide genomic estimated breeding values (GEBV) for nine traits related to growth, feedlot performance, carcase characteristics and immune competence. At present, GEBV for carcase characteristics are based on a reference population of 3766 Australian Angus steers.

Aims: We aimed to investigate the potential benefit of incorporating commercial data into the existing reference population of the Angus SteerSELECT. To this aim, we employ a population of 2124 genotyped commercial Angus steers with carcase performance data from four commercial feedlot operators.

Methods: The benefit of incorporating the commercial data (COMM) into the reference (REFE) population was assessed in terms of quality and integrity of the COMM data and meta-data to model the phenotypes adequately. We computed bias, dispersion, and accuracy of GEBV for carcase weight (CWT) and marbling (MARB) before and after including the COMM data, in whole or in partial, into the REFE population.

Key results: The genomic estimate of the Angus content in the COMM population averaged 96.9% and ranged from 32.87% to 100%. For CWT, the estimates of heritability were 0.419 ± 0.026 and 0.368 ± 0.038 for the REFE and COMM populations respectively, and with a genetic correlation of 0.756 ± 0.068. For MARB, the same three parameter estimates were 0.357 ± 0.027, 0.340 ± 0.038 and 0.879 ± 0.073 respectively. The ACC of CWT GEBV increased significantly (P < 0.0001) from 0.475 when the COMM population was not part of the REFE to 0.546 (or 15%) when a random 50% of the COMM population was included in the REFE. Similarly significant increases in ACC were observed for MARB GEBV (0.470–0.521 or 11%).

Conclusions: The strong genomic relationship between the REFE and the COMM populations, coupled with the significant increases in GEBV accuracies, demonstrated the potential benefits of including the COMM population into the reference population of a future improved version of the Angus SteerSELECT genomic tool.

Implications: Commercial feedlot operators finishing animals with a strong Angus breed component will benefit from having their data represented in the reference population of the Angus SteerSELECT genomic tool.

Keywords: accuracy, beef cattle, bias, carcase, feedlot, genomic predictions, heritability, marbling.


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