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DairyTalk 431: RZE vs. PTAT: Two breeding systems built for completely different outcomes - by Helmut Demmelhuber
This podcast episode is based on a technical article examining the fundamental differences between the German RZE system and the American PTAT approach in Holstein breeding. At the center is the question of why both systems evaluate similar type traits but pursue entirely different breeding objectives. While RZE is designed around functional, durable, and economically efficient cows for modern commercial housing systems, PTAT has traditionally placed greater emphasis on visual style and show-ring appeal. The analysis explains why direct numerical comparisons between the systems are misleading…
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