Episode 367 - HYAL1: A Hidden Genetic Defect Affecting Holstein Longevity - UMN Extension's The Moos Room

Fresh from World Dairy Expo, Brad Heins discusses the newly identified HYAL1 mutation in Holstein cattle and its implications for cow health, longevity, and farm profitability. Research in Switzerland and France links this recessive variant to swollen hocks, joint fluid buildup, impaired mobility, and reduced productive life in cattle that inherit two copies.

Brad explains how researchers uncovered a genetic problem that standard additive analyses missed, why joint abnormalities can appear before first calving, and how affected animals may experience lower production and earlier culling. He also explores the importance of combining genomic data with observations of cattle and how genetic testing and avoiding carrier-to-carrier matings could help prevent affected calves. Tune in for a practical look at what this discovery could mean for dairy breeding decisions and healthier, longer-lived cows.

The reported 4.4% and 8.4% are allele frequencies, not percentages of affected cattle; and affected animals inherit two copies of the variant.

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