LIMOUSIN TODAY LimToday_November18_WEB - Page 21

Performance Line Changes in EPDs By Tonya Amen, National Center for Beef Excellence It’s likely that you’ve probably noticed some recent changes to EPDs for Limousin and LimFlex animals. animals tested, but also relatives up and down the pedigree. In fact, due to relationship with animals who are tested and knowledge of the bovine As you’re aware, your National genome, even animals who are Cattle Evaluation (NCE) use to not tested receive an imputed be ran twice annually, usually at genotype. This highlights the the start of Fall and sometime importance of testing AI sires, in January. All performance donor dams, and any animals that have a high impact in your herd with a higher Genomic blending at density test, NALF the accuracy GE-EPDs of imputation for their progeny and other relatives depends on it. Figure 1: Former bi-annual NCE components. and pedigree information was used in the evaluation, and after the newly computed EPDs were received, genomic results were blended in-house post- evaluation (Figure 1). At that time, genomic results impacted only the animal that was tested. Early in August, NALF migrated to the much-awaited BOLT-powered evaluation. With that release, now all pedigree, performance and genomic information is used simultaneously (Figure 2). Additionally, genomic profile results not only impact the submitted. As illustrated in Table 1, genotyping an unproven potential sire or dam can add the same amount of accuracy as the submission of 15-20 performance records for the trait of interested measured on their progeny. We do hear a lot about genomics these days, but it is important to emphasize the importance of good, old- fashioned performance data. In addition to being critical for ensuring the efficacy of genomic tests, performance data is the only was to truly “prove” a sire or dam (Table 2). You’ll notice that 15-20 progeny records for In addition, EPDs are now are available on a weekly basis. Any performance data that you submit by close-of-business on Monday will be reflected in the EPDs released the following Monday. Likewise, any genomic results received by close-of-business Monday will be reflected in EPDs released the following Monday. Incorporating a genomic profile into the EPDs for young, unproven animals is a great way to increase accuracy and decrease risk of unanticipated EPD changes when the animal begins to have progeny data Figure 2: BOLT-powered EPD components a moderately heritable trait will yield an accuracy of .2-.4, which is about what you can expect for genomic results. LIMOUSIN Today | 19