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DairyTalk 232: From Brachyspina to HH6 - Genetic Defects in Holsteins - by Helmut Demmelhuber
This article provides a structured overview of the most relevant genetic defects in Holstein cattle and explains how genomic data enables responsible breeding decisions. It covers lethal conditions such as Brachyspina, CVM, and BLAD, as well as less visible risks like Holstein Haplotypes HH1–HH6 and Cholesterol Deficiency, which often manifest through fertility issues or high calf mortality. The key message is clear: carrier animals can remain valuable contributors to genetic progress, but only when managed through precise mating strategies. Sustainable breeding success depends on combining…
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