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DairyTalk 691: RZG or TPI? Why the Global Holstein Index Creates a Common Scale for International Sires - by Helmut Demmelhuber
This podcast episode is based on a technical article examining the Global Holstein Index as a new approach to comparing German and U.S. Holstein genetics on a common basis. RZG and TPI cannot simply be converted into one another because they differ not only in scale but also in the traits and breeding objectives they emphasize. GHI therefore works from individual trait information, standardizing values onto a shared measurement framework before applying a consensus breeding objective. Regression-based adjustments are also used to address systematic differences between genomic and…
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