Holstein Association USA’s Board of Directors has approved an update to the TPI® Formula to respond to the current needs of Registered Holstein® breeders and ensure the genetic tools keep pace with current and future industry trends. The change comes
from recommendations presented by the Genetic Advancement Committee during the Association’s recent Board Meeting March 26-27 in Kansas City, Missouri.
The information provided below is a brief update to notify the industry of the change before the upcoming genetic evaluation. More comprehensive background will be shared early next week.
TPI® Formula Update
The weighting for PTA Protein and PTA Fat within Holstein Association USA’s Total Performance Index® (TPI®) will be adjusted to better align TPI® with current and emerging trends in milk pricing and processor needs for fat to protein ratios. This change will be implemented for the upcoming April 2026 official genetic evaluation.
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Increasing the weighting on PTA Protein from 19 to 24
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Decreasing the weighting on PTA Fat from 19 to 14
This update adjusts only the relative emphasis placed on PTA Protein and PTA Fat; no other TPI® trait weightings will be affected. This update results in a very high correlation (0.9978) between the revised TPI® formula and the current version, indicating that the change represents a refinement, rather than a fundamental shift, in how animals are ranked. More information will be available early this week.
Holstein Association USA, Inc., provides programs, products and services to dairy producers to enhance genetics and improve profitability — including animal identification and ear tags, genomic testing, mating programs, dairy records processing, classification, communication, consulting services, and Holstein semen.
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