E647 9,860 First-Lactation VGs. Three Stress Tests. One Undisputed Winner.

E647 9,860 First-Lactation VGs. Three Stress Tests. One Undisputed Winner.

Raw 87-point daughter counts sell semen, but 9,860 Canadian first-lactations reveal only one sire passed every stress test: Blondin Detective.

On The Bullvine Podcast, we evaluate 46 major Holstein sires across three tests: stripping show herds, matching dam scores, and tracking two-season consistency. Against a 2.97% breed conversion baseline, Detective held across all three. Meanwhile, Walnutlawn Sidekick produced zero 87s from 102 VG-dam daughters, exposing the difference between finishing a great cow and building one.

• Why counting raw 87-point heifers rewards semen sales over true genetic transmitting ability

• How Mattenhof Harris and Blondin Detective maintain elite conversion when show barns are removed

• The mating split: why Walnutlawn Sidekick needs an EX dam to deliver an 87-point two-year-old

• Why Feet and Legs drives 87-point scores while Mammary System functions only as a qualifying floor

Unadjusted type proofs mislead mating decisions. Official August 2026 CAN-GEBV data shows Feet and Legs tracks elite conversion while Mammary System rankings fade into statistical noise. Sires like Progenesis Ambrose put 37% of daughters at 86+ but miss the top tier, proving operations must separate solid herd averages from true show-winning potential before buying semen.

Full article and sources: https://www.thebullvine.com/genetics-breeding/9860-first-lactation-vgs-three-stress-tests-one-undisputed-winner/ Subscribe for straight-talking dairy analysis. Share this with a producer who needs it.

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