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DairyTalk 569: PTAT or HCC? Redefining the Ideal Holstein Cow for Modern Dairy Farming - by Helmut Demmelhuber
This podcast episode is based on a technical article examining the introduction of the Holstein Conformation Composite (HCC) and its impact on modern Holstein breeding. At the center of the discussion is why the new HCC index produces markedly different rankings than the traditional PTAT system and what this means for breeding decisions. The article explains how HCC rewards functional balance, longevity, and economic performance, while PTAT has historically emphasized maximum expression of type traits valued in the show ring. It also explores why the weak correlation between the two indices…
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