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DairyTalk 717: Same Bull, Different Relationships: Why RZG and TPI Can Lead to Different Breeding Decisions - by Helmut Demmelhuber
This podcast episode is based on a technical analysis comparing German and U.S. Holstein genetic evaluations using 43 traits and 861 trait pairs from August 2026. While some relationships among health and fertility traits remain consistent across both systems, other correlations differ substantially, raising questions about how sire populations and selection criteria influence the results. In particular, apparently favorable relationships between production and fitness in U.S. sire lists may partly reflect selection effects rather than underlying genetic relationships. The article also…
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