Validating Genomic Reliabilities and Gains from Phenotypic Updates


  • Paul M VanRaden USDA Animal Improvement Programs Lab
  • Jeff R O'Connell University of Maryland - Baltimore


reliability, genomic prediction, validation, phenotypic update


Reliability can be validated from the variance of the difference of earlier and later estimated breeding values as a fraction of the genetic variance. This new method avoids using squared correlations that can be biased downward by selection. Published genomic reliabilities of U.S. young bulls agreed closely with validation formulas. Similar formulas based on reliability differences can estimate potential gains from more frequent phenotypic updates such as monthly or weekly updates, but those gains are small when young animal reliabilities are high.

Author Biographies

Paul M VanRaden, USDA Animal Improvement Programs Lab

Research geneticist

Jeff R O'Connell, University of Maryland - Baltimore

School of Medicine