Beef DNA Data

On Friday, September 19th, 2014 the new Angus EPD release was updated with the fourth Calibration for genomic tests. The initial incorporation of genomic information into Angus EPDs occurred in 2010, and previous recalibrations were conducted in 2012 and 2013.

What is the purpose of recalibration?
        Recalibration is the process of updating the equations used to incorporate genomic test results into genomically-enhanced EPDs (GE-EPDs). Throughout the year, the association receives new DNA test results as well as new data on tested animals. Compared with calibration 3, completed in December 2013, the number of animals used in training for the newly-released calibration increased 47%. The new calibration increases the accuracy and power of GE-EPDs.
Why is this change happening now?
        Recalibration is a significant undertaking. Work on this recalibration began in March, and was just completed recently. Once AGI staff had thoroughly reviewed the results of recalibration, the new information was incorporated as quickly as possible, to provide Angus breeders with the most accurate GE-EPD possible in a timely manner.

How will these changes affect Angus GE-EPDs?
        For proven animals with large amounts of progeny data submitted, changes will be fairly minimal. However, lower accuracy animals (those with little or no progeny data) that have been tested with the Zoetis HD 50K or GeneSeek GGP-HD, will potentially change to a greater degree. In all cases, new GE-EPDs are more accurate than the values they replace.

Will percentile ranks provided with genomic testing change?
        Yes. Percentile ranks for animals tested with the Zoetis HD 50K or GeneSeek GGP-HD will be updated to reflect the larger pool of animals that have been tested since the last recalibration. Animals that were tested prior to recalibration will have their percentile ranks updated, so that animals tested in the future can be compared to those tested previously.

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