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Project Design

To determine if the EBVs of sires when they were initially joined in the ASBP aligned with their EBVs when their progeny had been comprehensively performance recorded, the following steps were undertaken.

  1. Initial EBVs: EBVs and EBV accuracies were calculated utilising the latest Angus BREEDPLAN analytical software, based on the pedigree and performance information that was available when the sires were entered into the ASBP. Ensuring that the latest Angus BREEDPLAN analytical software was used was important in accounting for the influence of any changes that had occurred to the analytical software while sires were being evaluated in the ASBP.

The performance information utilised to generate the EBVs for sires in each cohort was as follows:

  • Cohort 1 EBVs (based on information available at the October 2010 Angus BREEDPLAN analysis)
  • Cohort 2 EBVs (based on information available at the October 2011 Angus BREEDPLAN Analysis)
  • Cohort 3 EBVs (based on information available at the October 2012 Angus BREEDPLAN analysis)
  1. Final EBVs: The EBVs and EBV accuracies for each sire once they had been progeny tested in the ASBP were collated. The “final” EBVs included comprehensive performance information obtained from the progeny of each sire in the ASBP, as well as other industry data. All sires had also been genotyped and their genomic predictions were incorporated in the calculation of their Final EBVs.
  2. Once both the “initial” and “final” EBVs and EBV accuracies from each sire had been collated, the “initial” EBVs of sires in each cohort were ranked from highest to lowest for each trait, and the average “initial” EBV and EBV accuracy of the highest and lowest 10 sires for each trait was calculated. This was then compared to the corresponding average “final” EBV and EBV accuracy for these sires, to evaluate how much change in EBVs and EBV accuracies had occurred.