New genetic changes and classification updates support dairy breeders
Holstein Association USA has approved several key updates to support Registered Holstein breeders and improve genetic and classification tools. These changes were recommended during a recent board meeting and aim to match evolving dairy industry needs.
“These recommendations reflect direct input from our members and a careful look at where the industry is headed. The result is a set of updates that strengthen the tools breeders use every day and position the Holstein breed for continued success,” said Holstein Association USA CEO Lindsey Worden.
One major update is the revision of the Total Performance Index (TPI®) formula. The weighting for PTA Protein will increase from 19 to 24, while PTA Fat will decrease from 19 to 14. This adjustment reflects current market demand for protein and better aligns with milk pricing trends. Despite the change, the updated formula remains highly consistent with the previous version, ensuring minimal disruption for breeders.
Another important development is the introduction of the Holstein Conformation Composite (HCC). This new tool helps breeders identify animals with balanced structure, strength, and long-term durability. HCC will be released alongside existing traits such as PTAT, Udder Composite, and Foot & Leg Composite. It provides an alternative evaluation by focusing on the relationship between traits rather than final scores alone.
In addition, a sliding scale penalty for stature will begin in May 2026. The ideal height is set at 60 inches, and animals that exceed this may receive a penalty in their classification score. This encourages breeders to avoid extreme size and focus on balanced and functional cows.
Another update affects Breed Age Average (BAA) eligibility. Only cows that have been calved within the last 24 months will be included in herd calculations. This ensures that BAA reflects currently productive animals.
These updates aim to strengthen breeding tools and help farmers make better decisions for future herd success.
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