Genetic Groups in Dairy Sire Evaluation under a Selection Model

Abstract

The frequently arbitrary application and definition of genetic groups makes sire grouping the “weak link” of the sire evaluation process. A selection model for records not in the model for observations is similar in form to the genetic groups model. Implications of this correspondence are discussed and illustrated through a small example. Guidelines for possible grouping strategies also are discussed. © 1983, American Dairy Science Association. All rights reserved.