E642 Nordic Holstein Coancestry Rose Twentyfold. Your Inbreeding Percentage Won’t Show You.

Seven of the top ten August 2026 GTPI sires share one father. While herdbook mating reports look stable, underlying genetic diversity is collapsing.

On The Bullvine Podcast, we break down why pedigree inbreeding numbers fail to flag real breeding risk. Canadian Holstein inbreeding reached 9.99% in 2024, climbing at double the rate of other breeds. While trade proposals push for European import quotas, new peer-reviewed research shows passport screening misses the mark. Discover why screening for genomic relationship values to your herd is the only tool that protects genetic progress.

What You Will Learn

• Why pedigree inbreeding numbers masked a 20x surge in Nordic Holstein female coancestry

• How 7 of 10 August 2026 GTPI sires trace back to one bull

• Why a 5% European import quota targets the wrong genetic problem

• How juvenile IVF and genomic pre-selection quietly narrowed the female base

• What a 12-month semen invoice audit reveals about your actual sire-of-sons diversity

• Why asking your AI supplier for genomic relationship values beats catalogue outcross claims

Relying on pedigree inbreeding alone gives false security. While pedigree studies suggested Nordic diversity grew, genomic analysis proved effective population size crashed from 198.8 to 42.7. Sires span a 28-point genomic relationship spread in Canadian research, dwarfing differences between countries. Producers learn actionable steps to audit their tanks and make data-driven mating decisions.

Full article and sources: https://www.thebullvine.com/genetics-breeding/holstein-coancestry-pedigree-inbreeding/ Subscribe for straight-talking dairy analysis. Share this with a producer who needs it.