US dairy herd dynamics: dairy heifer supply and beef-on-dairy
- ZISK
- Apr 7
- 1 min read
The U.S. dairy herd has exhibited unusual dynamics in recent years that reflect changes in relative prices, technology, and management. The table displays year-over-year changes in national milk cow numbers, replacement heifers expected to calve, and total dairy cows culled. Several patterns stand out. Most notably, replacement heifer numbers have declined each year, even as milk cow numbers rose in 2025. The final column helps explain how this occurred: Dairy cow culling fell sharply in both 2024 and 2025.
Beef markets are shaping dairy supply decisions in ways milk markets alone no longer control. The U.S. beef cattle herd is in the late stages of a historic contraction, with inventories at multi-decade lows and meaningful rebuilding unlikely before next year due to limited heifer retention, high input costs, and lingering drought effects. Tight beef supplies have pushed cattle prices to record levels and elevated the value of dairy-beef calves, making dairy herds an increasingly important source of feeder cattle. For dairy producers, this environment strengthens the short-run incentive to use beef semen on cows not needed for replacements, improving liquidity through immediate calf revenue.
April 1, 2026
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