Lactanet just put Holstein heifer inbreeding at 9.99%, and on a 500-cow herd, that gap models out to $54,665 a year in lost milk alone — before fertility, embryo loss, or longevity drag.

For two decades the pitch has been "buy what you can't breed." Four families said no. The Bullvine Podcast walks through Larenwood (closed since 1956), Bokma's seven-robot Master Breeder operation, Brigeen Farms (working the same Maine ground since 1777), and Quebec's Saintour — and the barn math the open-catalog model quietly hands the average herd.

What You'll Learn

Why 99% of active Holstein AI bulls still trace to two foundational sires born in the early 1960s
How the Doekes and Makanjuola coefficients turn 1% of inbreeding into 80–108 lbs of lost milk
Why closing the gates doesn't fix the problem — curating the bull list does
What a 9.0–9.5% EPI cap and HH1 through HH6 blocking look like in practice
Why springing-heifer prices near $3,010 and a 47-year low replacement inventory change the closed-herd math in 2026
The 30-day mating-software audit any open-catalog herd can run before the next semen order

On a 1,500-cow herd carrying two extra points of inbreeding, the modeled hidden tax — milk drag, modeled abortion and embryo losses, and 20 to 30 extra replacements at $3,010 each — lands somewhere between $90,000 and $180,000 a year. Closed herds with disciplined sire rotation pay a fraction of that. The point isn't that closing the herd erases inbreeding — it's that these breeders are the ones who actually know what they're paying.

Full article and sources: https://www.thebullvine.com/genetics-breeding/closed-since-1956-4-master-breeder-families-and-a-54665-inbreeding-bill/. Subscribe for straight-talking dairy analysis. Share this with a producer who needs it.