DairyTalk 233: Healthy Cows, Lost Pregnancies: The Risk of Holstein Haplotypes - by Helmut Demmelhuber

DairyTalk by Helmut Demmelhuber · Jan 12, 2026 · 12m

This article explains the significance of Holstein haplotypes HH1 through HH6 and why they represent one of the most critical hidden risks in modern dairy breeding. Although carrier animals appear perfectly healthy and often perform at a high level, mating two carriers of the same haplotype results in early embryonic loss or miscarriage—typically unnoticed, yet costly in terms of fertility and profitability. The text emphasizes that effective haplotype management does not mean culling valuable genetics, but applying precise mating strategies. When genomic data is used correctly, breeders can…