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Project Design

To evaluate how well the BREEDPLAN EBVs of the sires in cohorts 1 to 3 of the ASBP aligned with the actual performance of their progeny, the following steps were completed:

1. EBVs were generated based on the pedigree and performance information that was available when the sires were entered into the ASBP, utilising the latest Angus BREEDPLAN analytical software. 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)

2. The performance of progeny for all traits was collated and the standard BREEDPLAN adjustments and contemporary groupings applied.

The performance data was then analysed through the Statistical Analysis System (SAS) to generate Least Squares Means (LSMs), being each sire’s average progeny performance for each trait.

3. Once the EBVs and progeny performance of each sire had been collated, the EBVs of sires in each cohort were ranked from highest to lowest for each trait. Then, the average EBV of the highest 10 and lowest 10 sires were used to calculate how much difference in performance was predicted between the progeny sired by bulls in each of the two groups.

The predicted difference was then compared to the actual difference in progeny performance that was observed within the ASBP to ascertain how well the EBVs predicted the breeding value of the highest and lowest 10 sires for each trait.