STtalks #380 - April 2026 Holstein Genetic Evaluations with Dan Carroll, Tim Rauen, David Kendall & Kevin Ziemba

In this episode of STtalks #380, hosted by Laura Demmer, the genetic development team at ST Genetics—David Kendall, Dan Carroll, Kevin Ziemba, and Tim Rauen—discuss the results and implications of the April 2026 Holstein genetic evaluations. The team highlights major shifts in the TPI formula, now emphasizing 24% protein and 14% fat, which has repositioned top sires and driven increased selection for protein pounds and percent. They emphasize the long-term vision behind this change, aligning with processor and consumer demand for improved protein-to-fat ratios. ST Genetics also shared updates on their internal indexes, including the revamped Robotic Cow Index (RCI), now based on 95% robotic data for greater objectivity, and Eco Dollars, which now balances protein and fat emphasis while adding weight to protein percent and feed efficiency. The episode showcases strong performance across ST’s proven sire lineup, with 35 bulls in the top 100 TPI and continued dominance from cornerstone bulls like Captain, Dominance, and On Duty. Captain’s release from the Legend program marks a pivotal moment, opening access to his genetics globally. The team also previews upcoming young sires, particularly in the polled and structured programs, and expresses excitement for future data from August’s proof run, including new fertility traits and the Holstein Confirmation Composite index. The episode closes with a forward-looking vision of ST Genetics as a technology-driven company focused on reliability, innovation, and customer profitability through genomics, digital data, and advanced reproductive technologies like cloning.