DairyTalk 229: Reading the Genomic Datasheet: What RZG Measures - and Why ZW² Matters - by Helmut Demmelhuber

The genomic datasheet is not a marketing claim but a technical
decision-making tool. This article explains why RZG is not a
fixed score, but a relative index that shifts over time as the
national genetic base improves. Particular attention is given to
the ZW² value, currently the most accurate breeding value
estimate, as it combines genomic information, pedigree data, and
offspring performance where available. The text clearly
differentiates between performance indices that aggregate
multiple traits and genetic markers that flag specific
characteristics or risks. The key message is clear: genomic
datasheets provide a truthful genetic foundation, but only
professional judgment, experience, and clear breeding goals turn
data into sustainable breeding decisions.