RAAA staff and Technical Committee are continuing their review of the RAAA EPDs in an effort to ensure the reliability of Red Angus genetic predictions. This process has identified minimal specific scenarios in which improvements can be made.
Last week an enhancement was made to the Stayability EPD calculation on animals with RA50K genomic data that had a Stayability Accuracy of 0. The process that incorporates the genomic data into an animal’s STAY EPD (with a STAY ACC of 0) was found to be using a default Stayability EPD, instead of the animal’s true Stayability EPD. This was viewed as a conservative ‘rule’, as animals with a 0 accuracy are several generations away from usable data for the calculation of their Stayability EPD. However, it was decided that the most appropriate strategy was to eliminate this rule, thus preventing the EPD calculation from using the default value. This enhancement will allow the system to use the animal's calculated, non-genomic Stayability EPD in the process that incorporates genomic data.
Non-Genomic EPD + Genomic Data = Published EPD
Due to the implementation of this programming change, producers may observe a change in an animal’s Stayability EPD. It’s important to realize that the only animals impacted by this enhancement are those animals that had RA50K genomic data AND had a non-genomic Stayability Accuracy of 0.
We recognize the above-described improvement will present unexpected challenges to some Red Angus producers through changes in their animals’ Stayabilility EPDs. However, RAAA is committed to providing accurate genetic descriptions on all Red Angus animals; thus, through fulfilling this duty, improvements must be applied immediately.