252
Genomic Breeding values from Across Breed Prediction in Practice: Accuracy of Beef-CRC Genomic Breeding Values in Australian Angus and Australian Brahman beef cattle

Friday, August 22, 2014: 10:30 AM
Bayshore Grand Ballroom D (The Westin Bayshore)
Vinzent Boerner , Animal Genetics and Breeding Unit, University of New England, Armidale, Australia
David Johnston , Animal Genetics and Breeding Unit, University of New England, Armidale, Australia
Bruce Tier , Animal Genetics and Breeding Unit, Armidale, Australia
Abstract Text: Genomic selection in the Australian
beef cattle sector is challenged by the variety of small
breeds and a low number of phenotyped and genotyped
individuals in each breed. The Beef Cooperative Re-
search Center (Beef CRC) derived prediction equations (PE) on mixed-breed and
pure-breed training sets. This paper presents the ac-
curacy of the resulting genomically estimated breeding
values (GEBV) assessed by their genetic correlation to
their phenotypic target trait recorded in the seed-stock
cattle populations of Australian Angus and Brahman.
Accuracies of the majority of GEBVs was between 0.1
and 0.4, and were highest when the PE of the pooled
across-breed training population were used. The difference in accuracies from using pure-breed PEs
were small. Results were generally low compared to accuracies estimated within breeds, but in line with those
derived in other across-breed populations. Thus prediction equations derived by the Beef CRC can contribute
to the implementation of genomic selection in Australian
beef cattle breeding.

Keywords:

beef cattle, genomic selection, across-breed prediction