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DairyTalk 703: Is TPI Really Balanced? Why Production May Dominate the Ranking More Than Expected - by Helmut Demmelhuber
This podcast episode is based on a critical analysis of how the U.S. TPI and Net Merit indexes influence Holstein sire rankings in practice. The evaluation suggests that fat and protein can exert a much stronger effect on the final ranking than the published index structure might initially imply. At the same time, highly ranked sires may still carry functional weaknesses involving metabolic stability, teat length, or feet and legs—traits with direct relevance for longevity and modern housing and milking systems. The article therefore explores an alternative weighting approach that gives…
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