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Project Design

To determine if the EBVs of each individual sire 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 for each individual sire utilising the latest Angus BREEDPLAN analytical software, based on the pedigree and performance information that was available when each sire was 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 the sire was being evaluated in the ASBP.

The performance information utilised to generate the EBVs for individual 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)

2. Final EBVs: The EBVs and EBV accuracies for each individual sire once they had been progeny tested in the ASBP were collated. The “final” EBVs included comprehensive performance information obtained from the progeny of the sire in the ASBP, as well as other industry data. All sires had also been genotyped and the individual sire’s genomic predictions were incorporated in the calculation of their Final EBVs.

3. Once both the “initial” and “final” EBVs and EBV accuracies from each individual sire had been collated, the “initial” EBVs and EBV accuracies of each sire were compared to their “final” EBVs and EBV accuracies, to evaluate how much change in EBVs and EBV accuracies had occurred.