One sire owns 7 of 10 U.S. GTPI. One cow backs 7 bulls across two lists. Six countries, one 72-hour window, one honest question: how related is your tank, actually?
Ocd Thorson Ripcord-ET sired 7 of the U.S. GTPI Top 10 and 8 of Net Merit’s. One cow — T-Spruce Jaela 47718-ET — sits behind seven bulls across those two lists. In Canada, one full-sibling pair jumped from ranks 31 and 44 to #1 and #3. In Italy, five of ten domestic genomic slots turned over in four months. The world’s Holstein A-list came out August 11–13 across six countries — and if you order semen off it without pulling pedigrees three generations deep, you’re not diversifying. You’re buying one flush three different ways.
Every four months the numbers reset, and every four months most pedigree breeders make the same mistake: they treat a new list of names as a new set of choices. This August 2026 Holstein sire run — released inside a 72-hour window by Holstein Association USA/CDCB, Lactanet Canada, ANAFIBJ Italy, CRV Netherlands, Qualitas AG Switzerland, and vit/BRS Germany — is the cleanest case study we’ve seen for why that framing is broken. Six independent evaluation systems. Six different indexes. Six different bull populations. And underneath, one pattern the numbers can’t hide: modern Holstein genetics run through a shockingly narrow pipeline of sires, dams, and — most invisibly — single cow families.
Honestly, the awkward part is how much of this is happening at generations three and four, exactly where most producers stop reading the sire card.
A note before we dig in: almost every genomic bull named below is a first-crop sire with 0 daughters milking. Reliabilities cluster at 65–82% on the genomic side and 84–99% on the proven side. Every “Top 10” ranking mentioned here that’s genomic-based can and will re-rank at the next run. That’s not a caveat — it’s the whole reason the concentration story matters. And one internal note we use throughout: volatility score is our descriptive metric for how much a top 10 turned over run-over-run (new entrants + drop-outs + rank changes of ≥2 places). A “loud” list is roughly 15+; a “quiet” list is under 10. Not a Lactanet or CRV-published figure — just a way to compare movement between lists in this piece.
The August 2026 Concentration Snapshot
| Country | Top 10 concentration this run | Turnover vs. April |
| USA (GTPI) | 7 of 10 by Ocd Thorson Ripcord-ET | 6 new entrants |
| USA (NM$) | 8 of 10 by Ripcord; 5 trace to Sdg-Ph Delux Dominance-ET as MGS | 6 new entrants |
| USA (Red & White GTPI) | 3 of 10 are full siblings out of Aprilday Pwrstar Aurora-ET RC | New #1 (+94 clear) |
| Canada (GPA LPI) | 5 of 10 trace to Stantons Revamp P or Remover PP | 9 of 10 new to top 10 |
| Canada (Domestic LPI) | 5 of 10 marketed by Select Sires; 6 of 10 by Select + Alta | 4 new entrants |
| Italy (Domestic Genomic gPFT) | 5 of 10 marketed by Intermizoo; 3 of top 8 are Vivify sons | 5 new entrants |
| Netherlands (Zwartbont Interbull) | 4 of 10 sired by Genosource Captain | 9 of 10 new to top 10 |
| Netherlands (Roodbont Interbull) | 6 of 10 owned by GGI; 3 of 10 by Sputnik Rf | 4 new entrants |
| Switzerland (ISET Genomic) | 3 of 10 share Gameday-ET as MGS | 3 new entrants; 3 out of top 100 |
| Germany (Schwarzbunt Genomic) | 6 of 10 are 2025-born new entrants; Argentum sires 2 of 10 | 6 of 10 new to top 10 |
| Germany (Rotbunt Genomic) | 7 of 10 marketed by Phönix | 1 new entrant |
Indexes are not numerically comparable across borders. Sources cited country-by-country below.
Here’s the full rundown, country by country, and what a working breeder should actually do with it before Monday.
The Ripcord Effect: Why the U.S. Top 10 Isn’t 10 Choices
Start with what will drive North American mating decisions this fall. In the August 2026 CDCB/Holstein Association USA run, Ocd Thorson Ripcord-ET sired 7 of the top 10 GTPI bulls and 8 of the top 10 for Net Merit $. On a list of ten bulls at the very top of the world’s largest Holstein population, one sire owns seventy to eighty percent of the slots.
Sire concentration is the easy story — but pull one generation further and it gets tighter, not looser. Genosource Judson-ET, Genosource Jacoby-ET, and Genosource Jrue-ET — three separate names on the top of GTPI and Net Merit $ — are full brothers out of Genosource Hobbs 81451-ET from the same embryo flush. Judson and Jacoby were born the same day, July 31, 2025. Jrue was born two days earlier. Same sire, same dam, same flush. Three catalog listings, one biological choice.
And there’s one cow underneath most of it: T-Spruce Jaela 47718-ET. She sits as granddam or great-granddam behind seven bulls split across the GTPI and Net Merit $ Top 10s — Jitters, Judson, Jacoby, Jethro, Jrue, Jaco, and Patriot 76 — through four different maternal branches. That’s a cow family concentration deeper than the “Ripcord” story alone tells you, and it only shows up if you pull the sire card two generations past what most catalog spreads print.
A second cow family sits under the Delux Dominance cluster. Genosource Detox-ET, Genosource Domination-ET, and Genosource Decipher-ET share identical dam, MGD, and MGGD (Genosource Devi 77158-ET → Genosource Devoid 70904-ET → Genosource Deviate 46921-ET). One female line, three sons in the Top 10.
THE FUNCTIONAL WARNING ON THE RIPCORD LINES
Every Ripcord son in the GTPI Top 10 posts positive UDC and negative FLC — udders up, feet-and-legs down. The verified spread across the seven Ripcord sons: UDC +0.25 to +1.07 (Riptide is the strongest udder in the group), FLC −0.16 to −0.78 (Judson is the weakest leg composite). On the Net Merit $ side, the split gets sharper — Genosource Valkyrie-ET posts the worst functional-leg composite in either merit Top 10 at FLC −1.41 with UDC −0.81.
Components and productive life hold up on paper — no Ripcord son in the GTPI Top 10 sits under +176 CFP or under +3.3 PL. But the linear pattern is real, and the commercial consequence isn’t in the printed proof: stacking these sires across generations, especially onto shallow-heeled or hock-in cows, will compound mobility risk in freestall herds two lactations forward. Protected mating on foot angle and rear-leg-rear is not optional for a Ripcord-heavy tank.
The structural corrections in the matrix. Look for outcrosses whose own sire cards carry positive FLC — that’s the real fix. In this run’s outcross set, Bomaz Royalist-P-ET (UDC +1.07, FLC +0.93) on the Red Carrier list and Farnear Aircraft-ET (91–92%R, daughter-proven) on the Red/RC PTAT list are the cleanest structural pairings for a Ripcord-heavy cow group; Progenesis Espressivo-P clears the pedigree side outright. Ask for FLC on the sire card of any Jaela-line straw before you order.
Two genuine outcrosses exist in the entire U.S. run:
- Progenesis Espressivo-P (Red Carrier GTPI #4, +3382, 77%R, 0 dtrs) — Beyond Hi-Level-ET × Trifecta Hike-ET × 3star Oh Ranger Red-ET on top; Progenesis Hike Escape RC × Progenesis Ranger Eskimo P RC × Progenesis Einstein Even P RC on the bottom. No traceable tie to Ripcord, Delux Dominance, Woodcrest King Doc, or T-Spruce Jaela on either side. The cleanest true outcross in the whole run.
- Genosource Jaco-ET (GTPI #8, +3608, 82%R, 0 dtrs) — the closest mainstream alternative, and the biggest jumper in the Top 10 at +128 with the group’s best reliability. Still traces to the Jaela family — just not through Ripcord.
For herds prioritizing fertility and feed economics under CDCB’s rebuilt evaluation, the bulls actually worth chasing sit lower on the list. Genosource Domination-ET (NM$ #2, $1,324, ~77–79%R, 0 dtrs) posts DPR +2.8, CCR +4.9, FSC +143.0 with Feed Saved +402 — the fertility/feed anchor of this run. His linear split (UDC +0.21, FLC −0.95) is less extreme than Valkyrie’s but still Ripcord-typical. S-S-I Stagger Baelum-ET (GTPI #9, ~77–79%R, 0 dtrs) carries the best fertility in the GTPI Top 10 — DPR +3.0, CCR +5.2, FSC +154.0 — and still lost two ranks, which tells you everything about how fast the list moved.
On the Red & White side, Aprilday Pwrstar Aurora-ET RC just placed three full-sibling sons in the same Top 10: Aprilday Orphs Aesop-Red-ET (#3), Aprilday Ancho Peppr-Red-ET (#6), Aprilday Hrok Athens-Red-ET (#7). One cow, three different sires, three Top 10 sons. Pick one deliberately, or don’t pick any.
The daughter-proven anchor in this Red-list section: Farnear Aircraft-ET (Red/RC PTAT #9, +3.02, 91–92%R) is the one genuinely daughter-proven bull in the entire U.S. lookup — a real daughter file with production and udder-linear depth behind him. If you want a lower-risk anchor for a Red mating plan while genomic-only names above him swing, that’s him.
Barn-math the $47 gap. Between Net Merit $ #1 (Jentry, $1,326) and #10 (Decipher, $1,279) sits $47 per animal — roughly $4,700 in projected lifetime profitability across a 100-cow group of daughters. Real money on a first-crop genomic proof.
Canada: One Bull Jumped 30 Places, His Full Brother Jumped 41
Canada’s August 2026 GPA LPI run handed the #1 spot to Stantons Overhaul-P (GPA LPI +4140, genomic, 0 dtrs) — up 159 points from +3981 (rank 31) in April. Nine of the ten August names are new to the top 10; five never appeared in April’s Top 100 at all. His full brother, Stantons Blast Off P (GPA LPI +4124, same sire Stantons Revamp P, same dam Stantons Lambda Margaret, 0 dtrs), moved from rank 44 to rank 3 in the same run.
Five of the ten August GPA LPI slots — Overhaul-P, Blast Off P, Stantons Target PP, Stantons Raise the Bar P, Stantons Agent PP — trace to sires Stantons Revamp P or Stantons Remover PP. That’s half the top of Canada’s genomic young-sire list running through one family’s breeding program. Target PP and Agent PP share dam Stantons What It Takes P. Overhaul-P and Blast Off P share dam Stantons Lambda Margaret.
A formula note worth flagging. Lactanet’s April 2026 LPI update shifted the Holstein Production subindex’s Fat:Protein weighting from 60:40 to 40:60 (higher-protein bulls now favoured) and added Calf Health to the Health & Welfare subindex. Both the April and August 2026 runs already reflect the same post-change formula, so the movements above are on a consistent scale — but any comparison you’re carrying forward from a pre-April printout is not.
What that’s worth in dollars: the gap between the Top 10’s highest Pro$ (Adaway Reaper Myboyblue-ET at $3,871) and lowest (Stantons Agent PP at $2,709) is $1,162 per animal. Applied across a 50-daughter sample, that’s roughly $58,100 in projected lifetime-profit difference — before a single daughter classifies or milks a day.
The proven side barely moved. Stantons Remover PP (LPI +3945, 98%R) took #1 domestic LPI, up 72 points from +3873 (rank 2) in April, swapping places with Siemers Rengd Parfect-ET (LPI +3932, 99%R, which gained 18 points itself and still slipped from #1 to #2). Six of April’s proven Top 10 are still there. And the stud story: Select Sires alone markets 5 of the August 2026 domestic Top LPI Top 10, with Alta Genetics adding a sixth. On the April run, Select Sires and Alta accounted for 9 of the 10.
MACE LPI — Canada’s ranking for foreign daughter-proven bulls — is the calmest list of all. RMD-Dotterer Bolt Action-ET has held #1 in both runs (+3927 April → +3950 August, 93%R). Has Giroud jumped from rank 33 to rank 4 (+124 points, 93%R), the standout mover.
The show-ring inheritance story. Jacobs Spear P debuts at #1 with +20 Conformation (+3900 LPI, genomic). Read his dam line and it becomes something else. His sire, Fraholme Vec Triton PP, sits at #43 on the same Conformation list at +16. His dam is a VG-86 (1-yr) by Allgaud out of a VG-87 (3-yr) by Ranger-Red, out of an EX-93 by Lautrust, out of Erbacres Snapple Shakira-ET EX-97 — the two-time Grand Champion and Supreme Champion of the World Dairy Expo International Holstein Show (2021 and 2023). Shakira is owned by Ferme Jacobs and partners of Cap-Santé, Quebec — the same Jacobs name behind the new #1 genomic Conformation bull. That is what a female line looks like when show-ring wins compound long enough to hand you a genomic proof. It’s also a reminder that Canadian type genetics still live in specific barns, not just spreadsheets. Character Andres holds #2 at +19 Conformation, tied with six other bulls at the identical value — a jam at the top the kind of pedigree work above tends to break through.
Read more: Stantons Overhaul-P Tops Canada’s August 2026 Genomic Rankings
Italy: Five Bulls Just Fell Out of the Top 10 in One Run
Italy’s August 2026 ANAFIBJ gPFT run is the most volatile of the six analyzed. (gPFT is Italy’s total-merit index for Holstein; IES € is the domestic economic sub-index; ICS-PR € is a production-focused economic composite. All three come from ANAFIBJ; all three move together but at different rates.) Five of ten domestic genomic top 10 bulls are new. The previous #1, ECBERT, slipped to #3. The new #1: QHR Inseme Santry ET (Rome × Cronk, Inseme) at +5487 gPFT / +1386 IES € / +1440 ICS-PR € (Rk 99, ANAFIBJ’s max genomic reliability, no daughters).
Five bulls need same-week replacement if they’re on your Italian mating list: Go-Farm Mirosh ET (was #4), DM Saxony (was #5), Isolabella Liverpool (was #6), Wil Sonador RF (was #9), GGA Jegolo (was #10 despite gaining 7 gPFT points — the list moved underneath him).
The trait swaps are cleaner than the ranking shuffle suggests:
- Kg Fat / component power (Mirosh, Sonador): swap in Passini Odino (+0.28% fat) or GPlus Oakland(+0.60% fat, 107 Kg Fat).
- Raw milk volume (Jegolo): swap in QHR Santry (+1,903 Kg Milk, now #1 overall).
- Udder quality (Liverpool): swap in Passini Odino (Udder cmp 117, F&L 1.90 — best udder in the top 10).
- Balanced type + longevity (Saxony): swap in SH Jalnus ET — AA κ-casein, Longevity 116, balanced fat/protein.
The Vivify concentration problem is real. Vivify sons hold 3 of the top 8 domestic genomic slots (Rascasse #4, Odino #6, Stormur #8). If your Italian herd is already Vivify-heavy, the outcross plays that don’t cost index are QHR Santry(Rome × Cronk), GPlus Oakland (Owen × Captain), and Gill Impeto (GTA × Beerbum).
On the daughter-proven side, Go-Farm Boero ET RF took #1 at +5241 (+79 in one run, Crisalis RF × Pursuit), unseating stablemate ZFZ Crisalis RF (–86). Boero is Italy’s highest reliability-plus-gPFT combination if you won’t bet contract heifers on genomic-only bulls.
The ceiling story worth pausing on. Denovo Locust-ET widened his Interbull-converted lead to +5613 gPFT — +126 clear of Santry, +372 clear of Boero. That’s the difference between what the Italian scale actually rewards and what an Italian breeder can safely mate to this month. If you can source him through the foreign-genomic pathway, he’s the real Italian ceiling.
And Progenesis Vivify himself graduated to foreign-proven #1 at +5491, putting Vivify and Santry inside noise of each other at the second tier. Intermizoo houses 5 of 10 domestic genomic slots (Huller, Rascasse, Impeto, Jalnus, Bangles) — the strongest single-stud grip on the Italian genomic list in the two runs directly comparable. Inseme (Santry, Stormur) and Chiacche./ABS Italia (Ecbert, Odino) are actively contesting it with the biggest movers.
Read more: ANAFIBJ August 2026 gPFT: QHR Santry Debuts at #1 (+5487) as Five Bulls Fall Out of Italy’s Top 10
The Netherlands: The Same Bull, Two Different Numbers, Same Publication
Take one thing from the Dutch August 2026 NVI run: Peak Powerstar is carrying two published values this cycle — +303 NVI on April’s Interbull-converted list, +338 NVI (78%R, 57 dtrs) on August’s national daughter-proven list. Same bull. Same genetics. Same barn. Different daughter-eligibility pool. A 35-point gap.
That’s not a re-evaluation. That’s a category migration — a bull whose Dutch daughter file grew large enough to move him from foreign-converted MACE data to the domestic proven list. Same animal, different math. If you selected off April’s Interbull number, the number on his current national-proven card is 35 points higher not because he improved, but because his daughter file crossed a category threshold.
The Zwartbont Interbull-converted list posted the loudest movement (volatility score 19 — see intro note): nine of ten April slots gone. Dg Dr. No (Captain × Crimson, Tot) now leads at +349 NVI on 273 daughters, 84%R — though his own number actually fell 11 points from a previously reported +360. The rank looks like a rise; the bull went down. Clear-Echo Rix Rimbot (Rix × Denovo 2981 Sheldon, WWS) jumped 66 points from +249 to +315 NVI on 435 daughters, 70%R — the single biggest gainer in either Dutch daughter-proven list.
Captain-sired bulls occupy four of ten slots in the Zwartbont Interbull-converted top 10 (Dg Dr. No, Dg Just In Time, Dg Peace, Sdg Gs Gotti). For breeders wanting to avoid stacking Captain, Progenesis Vivify (Royalflush × Altaplinko, +323 NVI, 284 dtrs, 79%R) and Clear-Echo Rix Rimbot (+315 NVI, 435 dtrs, 70%R) are the ones outside that sire line entirely.
On the Roodbont side, Ceh Spotlight (Sputnik Rf × Gywer Rdc) held #1 in both runs at +321 NVI (346 dtrs, 72%R). GGI owns six of the ten slots. Sputnik Rf alone sires three of the ten (Ceh Spotlight, Stb Spot-Red P, Shake Red). Breeders wanting to break from both need 3star Keane PP Red (Mars P-Red × Solitair P — still GGI, +290 NVI, 104 dtrs, 72%R) or Global Red (Gnabry × Solitair P — outside GGI and outside the Sputnik Rf line, +278 NVI, 50 dtrs, 71%R).
The deepest daughter file in the whole Dutch dataset — and it’s not on the loudest list. Bomaz Magnific-Et(Zwartbont Interbull-converted #8, +314 NVI, 876 daughters, 74%R) carries more than three times the daughter count of anything else in that top 10. Dg Dv Rammstein Red (Roodbont National-proven #4, +318 NVI, 595 daughters, 89%R) is the deepest daughter file among the Roodbont bulls. If proof stability outranks peak NVI on your list, those two are the anchors in the whole Dutch run.
Read more: The Peak Powerstar Effect: Navigating Netherlands August 2026 NVI Rankings
Switzerland: Three Former Top-10 Bulls Just Vanished
Switzerland’s August 2026 ISET Genomic run held Progenesis Torchlight at #1 (+2 to 1521 ISET, 70–72%R, 0 dtrs). (ISET is Holstein Switzerland/swissherdbook’s total-merit index, published by Qualitas AG; it weights milk yield, components, functional traits and type on a nationally-calibrated scale — a top ISET score is not directly comparable to a top GTPI or LPI.) The real story is who’s gone. Progenesis Timeout, April’s #7 at 1476, dropped out of the top 100 entirely in one run. Les Verdaux Egan (April #9) and Sous-Moron Boston (April #8) also vanished from the top 100.
Behind Torchlight, DG Eliandro debuted at #2 (1520 ISET, 70%R, no prior top-100 ranking) on a volume-first profile — 2,063 kg milk (roughly 4,550 lb), modest components. Opposite profile at #10: Eichhof Dover (1468 ISET, 70–72%R) with just 1,416 kg milk but +0.56% fat and +0.30% protein. Same index, opposite paths.
Gameday-ET sits as maternal grandsire behind three of the current top 10 — Torchlight, Cookiecutter Hadley (1509 ISET), and TGD-Holstein Monset (1504 ISET, ITP 129 / udder 129 — the strongest type stack in the group). Herds diversifying away from that MGS line should look at DG Eliandro (MGS Altaalanzo-E) or Lars-Acres Caruthers-S (1502 ISET, MGS Van Gogh-ET, 70%R).
The domestic daughter-proven ISET list sits over 100 points below the genomic ceiling — Progenesis Topstory leads at just 1416 ISET (~94–96%R). That gap isn’t because Torchlight is a verified better animal. It’s because a 70–72% reliability genomic proof carries less statistical caution than a 90%+ reliability daughter-proven one. Three bulls vanishing from the top 100 in one run is what that caution looks like in practice.
The proven mover: Peak Leeder jumped from rank 4 to rank 3 (+26 points, 1383 → 1409 ISET, reliability climbing 94% → 96% alongside) — a genuine daughter-driven gain, not a re-rank artifact. The other one worth naming: 3Star Oh Ranger (1397 ISET, 99%R) — the highest-reliability proven sire on the entire Swiss list. If you want minimum re-rank risk into December in the Swiss population, that’s your name.
Germany: Six New Bulls Just Rewrote the Schwarzbunt Genomic List
Germany’s 11 August 2026 RZG run posted the most dramatic reshuffle of any list in this global set. Six of ten Schwarzbunt genomic top 10 bulls are 2025-born new entrants that don’t appear anywhere in April’s top 100: Harmony, Rovis, Artistic, Agent, Almonty, Smetana — every one of them at 77%R with 0 daughters.
Connect (Comet-sired, SYNETICS) held #1 at +166 RZG (77%R, RZM 150 / RZN 136 — a rare high-milk / high-fitness combination). Behind him, six former April top-10 bulls fell clear out of the top 10:
- Remco (April #2 at +162) → #24 at +157
- Realpower (April #3 at +161) → #13 at +158
- Realside (April #4 at +161) → #19 at +157
- Evenstar (April #7 at +161) → #23 at +157
- Romantiker (April #8 at +161) → #16 at +158
- Highmilk (April #9 at +161) → #32 at +156
If Remco or Realpower is queued in a German mating plan built off April data, that plan is running on numbers four months stale.
On the Schwarzbunt proven side, Zivet (SYNETICS, +148 RZG, 97%R, RZM 150) took #1 with a +4 gain from +144 — the largest RZG gain of any bull tracked in this global report. Former #1 Picard (91%R) fell –6 (+148 → +142) to #3.
Watch this move. Comeback jumped from rank #22 to rank #6 on a +2 RZG gain (+139 → +141, 92%R). That’s a 16-place rank climb — the sharpest rank movement on any proven list in this global run, and it happened on essentially unchanged raw genetics. That’s what a list looks like when everyone above a bull loses ground while he holds his.
Rotbunt — Germany’s Red Holsteins — is quieter. Skype Red holds #1 at +163 RZG (77%R, unchanged from April), but only because Harmonic P (April’s leader) dropped 2 points. Nine of ten anchors carried over. On the proven side, three brand-new entrants — Spooky Red (+143 RZG, 87%R), Master P (+139, 87%R), Mat Red P (+137, 85%R) — cracked the top 10 on their first appearance in the daughter-proven population as they crossed from genomic-only into proven status.
Phönix places 7 of 10 Rotbunt genomic slots, 6 of 10 Rotbunt proven slots, and 5 of 10 Schwarzbunt genomic slots. Structural, not accidental.
Reliability anchors on the German proven lists: Mirco (+140 RZG, 98%R) on Schwarzbunt, Ginger (+138 RZG, 97%R, 1,204 daughters) on Rotbunt. If you want minimal re-rank risk into December in the German population, those two are the closest to guarantees in the whole dataset.
Read more: Germany’s August 2026 RZG Run: Zivet Retakes the Schwarzbunt Proven Crown
What Actually Unites Six Countries This Run
Read the six reports side by side and the same forces keep showing up.
Sire concentration is real and getting worse. Ripcord owns 70–80% of the U.S. GTPI/NM$ top 10s. The Stantons cohort owns 50% of Canada’s GPA LPI top 10. Captain owns 40% of the Dutch Zwartbont Interbull-converted top 10. Vivify sons hold 3 of Italy’s top 8. Phönix places 7 of 10 slots in Germany’s Rotbunt genomic list. Different indexes, different countries, same problem: fewer sires and studs are producing more of the top of every list.
Cow families are the deeper concentration, and almost nobody’s counting them. T-Spruce Jaela 47718-ET backs seven bulls across the U.S. GTPI and NM$ Top 10s through four different maternal branches. Genosource Deviate 46921-ET stacks three sons in one U.S. NM$ family. Stantons Lambda Margaret produced both Overhaul-P and Blast Off P — the #1 and #3 of Canadian GPA LPI. Aprilday Pwrstar Aurora-ET RC placed three full-sibling Red & White sons in the same U.S. Top 10. When you cross-check sire, then MGS, then MGD/MGGD, most “diversified” tanks turn out to be one or two cow families in disguise.
The volatility gap between genomic and daughter-proven lists is now the story, not a footnote. Italy turned over 5 of 10 domestic genomic slots in four months. Germany’s Schwarzbunt genomic list turned over 6 of 10. Switzerland lost three former top-10 bulls out of the top 100 entirely. The Netherlands’ Interbull-converted lists posted volatility scores of 19 (Zwartbont) and 12 (Roodbont); their National daughter-proven Roodbont list scored just 4. Canada’s proven MACE LPI list barely moved. The genomic side of every index in this run rearranged itself. The deep-daughter proven lists barely blinked. That’s not a temporary quirk — it’s the structural cost of ranking bulls on parent-average and genomic markers before daughters classify.
And the Peak Powerstar case in the Netherlands shows the fourth force nobody wants to talk about: the same bull can carry two different official numbers on the same publication cycle depending on which daughter-eligibility pool he falls into. +303 NVI on the Interbull list. +338 NVI on the national proven list. Same barn, same daughters, different math.
The December Watch List
Every four months you look at a top 10 you didn’t expect. Here’s who to actually track between now and December’s runs, drawn from this cycle’s movement patterns:
- Genosource Jaco-ET (USA GTPI #8) — biggest jumper in the U.S. Top 10 (+128), best reliability of the group at 82%R. If he holds through daughter arrival, the Jaela-line challenger everyone will chase in December.
- Stantons Overhaul-P / Stantons Blast Off P (Canada GPA LPI #1 and #3) — one full-sibling pair, both zero daughters, both first-run entrants at these levels. First-daughter data lands and this pair either confirms the flush or gives back all 159 points.
- Peak Altasamson (Netherlands Zwartbont Interbull #2) — 65%R on just 85 daughters at +348 NVI. Lowest-reliability high-index bull in the whole Dutch dataset. He either stabilises or corrects hard.
- Peak Powerstar (Netherlands National-proven #4) — the category-migration case. His number moved 35 points in one publication cycle; watch which daughter pool his December number lives in.
- QHR Inseme Santry ET (Italy Domestic Genomic gPFT #1) and 3STAR Huller (Italy #2) — first-run debuts at the top of the pyramid, both Rk 99 but both first-cycle on the Italian scale. Two candidates to move meaningfully next run.
- Peak Altasafezone-ET (Italy Foreign Genomic gPFT #7) — biggest single-run rank jump on Italy’s foreign list, from #20 to #7 (+87 gPFT). The bull to watch next run on the Interbull-converted side.
- Harmony, Rovis, Artistic, Agent, Almonty, Smetana (Germany Schwarzbunt Genomic #2–#8) — six 2025-born bulls now sitting in Germany’s genomic top 10 with 0 daughters and 77%R. At least two of these will re-rank meaningfully.
- Krispy / Milo (Germany Schwarzbunt Proven #2 and #4) — first-appearance proven bulls at 88%R. The volatility plays on the proven side.
- Comeback (Germany Schwarzbunt Proven #6) — the +2 gain that jumped 16 ranks. If everyone above him keeps giving ground, he’s the December #3 or #4 candidate.
The Global Outcross & Specialist Matrix
Six countries, one 72-hour publication window, one honest answer to the question “which sire should I use?”: check the pedigree, not just the ranking. Sire tells you 25% of the pedigree story. Add maternal grandsire and you’re at 50%. Add MGD and MGGD — the fields most catalogs bury — and you’ll find the T-Spruce Jaela cases and the Stantons Lambda Margaret cases before you buy the same genetics three different ways.
One table. Every named outcross, fertility/feed anchor, and reliability anchor from all six countries. Reliability and daughter counts drawn from the source articles; watch-outs are the specific trade-off the source names for that bull.
| Sire | Country / list | Key index | Rel / Dtrs | Breeding role & pedigree cleanliness | Watch-out trait |
| Progenesis Espressivo-P | USA Red Carrier GTPI #4 | +3382 GTPI | 77%R / 0 dtrs | True U.S. outcross — clean of Ripcord, Delux Dominance, Woodcrest King Doc, and Jaela on both sire and dam sides | Red Carrier only (not black-and-white); modest +12 GTPI gain this run |
| Genosource Jaco-ET | USA GTPI #8 | +3608 GTPI | 82%R / 0 dtrs | Closest mainstream U.S. outcross; +128 biggest riser in Top 10 | Still traces to T-Spruce Jaela family — don’t stack with other Jaela bulls |
| Bomaz Royalist-P-ET | USA Red Carrier GTPI #2 | +3425 GTPI | Genomic / 0 dtrs | Polled/Red package (PC PO RC); elite udder + leg linears — UDC +1.07, FLC +0.93 — the rare positive-FLC option in this dataset | Bomaz Legacy cow family — check against existing Bomaz genetics |
| Genosource Domination-ET | USA NM$ #2 | ~77–79%R / 0 dtrs | Fertility/feed anchor: DPR +2.8, CCR +4.9, FSC +143.0, Feed Saved +402 | UDC +0.21, FLC −0.95 — Ripcord-typical leg trade | |
| S-S-I Stagger Baelum-ET | USA GTPI #9 | +3606 GTPI | ~77–79%R / 0 dtrs | Best fertility in GTPI Top 10: DPR +3.0, CCR +5.2, FSC +154.0 | Lost 2 ranks despite gaining 59 points — list moving underneath him |
| Farnear Aircraft-ET | USA Red/RC PTAT #9 | +3.02 PTAT | 91–92%R / proven | Only genuinely daughter-proven bull in U.S. lookup; full production + udder-linear file | Below the raw genomic ceiling on the Red list |
| Peak Altadestino-ET | Canada GPA LPI #7 | +4087 GPA LPI | 77%R / 0 dtrs | Canadian outcross: Peak Lorax-ET line; clears Stantons Revamp/Remover | First-run entrant to Top 10 — no prior LPI history at this level |
| Cristella Vertigo ET | Canada GPA LPI #9 | +4051 GPA LPI | 77%R / 0 dtrs | Canadian outcross: Cookiecutter Hadley-ET line; clears Stantons Revamp/Remover | New to the Top 10 this run |
| Stantons Remover PP | Canada Domestic LPI #1 | +3945 LPI | 98%R / proven | Proven-side anchor: gained +72 pts April→August; Canada’s flagship proven bull this run | Same Stantons Revamp/Remover MGS pool driving the genomic list concentration |
| Siemers Rengd Parfect-ET | Canada Domestic LPI #2 | +3932 LPI | 99%R / proven | Highest reliability on Canada’s domestic proven list; gained 18 pts and still slipped from #1 | Select Sires marketing — same stud running 5 of Top 10 |
| RMD-Dotterer Bolt Action-ET | Canada MACE LPI #1 | +3950 MACE LPI | 93%R / proven | Steadiest bull across either Canadian index this cycle — held #1 both runs | Foreign-daughter file — figure moves with each MACE update |
| Peak Altahothand-ET | Canada Domestic LPI #7 | +3835 LPI | 99%R / proven | 99%R proven anchor from a non-Stantons sire line | Slipped 18 pts (April #5 → August #7); Alta Genetics marketing |
| QHR Inseme Santry ET | Italy Domestic Genomic gPFT #1 | +5487 gPFT | Rk 99 / 0 dtrs | Italian Vivify-free anchor (Rome × Cronk); +1,903 Kg Milk — highest raw yield in Top 10 | First-run debut at #1 — full recalibration risk next cycle |
| GPlus GP-Oakland | Italy Domestic Genomic gPFT #9 | +5302 gPFT | Rk 99 / 0 dtrs | Vivify-free component specialist: +0.60% fat, 107 Kg Fat, 80 Kg Pr | Fert 87 is the persistent brake on this profile |
| Gill Impeto | Italy Domestic Genomic gPFT #5 | +5317 gPFT | Rk 99 / 0 dtrs | Vivify-free volume-plus-quality: +1,507 Kg Milk, 80 Kg Fat, IQC 115 | First-run entrant at #5 — no prior top-10 track record |
| Go-Farm Boero ET RF | Italy Domestic Proven gPFT #1 | +5241 gPFT | Proven | Italy’s highest reliability-plus-gPFT combination on the proven side | Sits well below Denovo Locust’s +5613 Interbull ceiling |
| Denovo 23392 Locust-ET | Italy Foreign Genomic gPFT #1 | +5613 gPFT | Genomic | The real Italian ceiling — +126 clear of Santry, +372 clear of Boero | Foreign-sourcing pathway; not on domestic list |
| Progenesis Vivify | Netherlands Zwartbont Interbull #3 | +323 NVI | 79%R / 284 dtrs | Non-Captain outcross on Dutch Zwartbont; established daughter file | Same Vivify concentration playing out on the Italian genomic list |
| Clear-Echo Rix Rimbot | Netherlands Zwartbont Interbull #6 | +315 NVI | 70%R / 435 dtrs | Biggest gainer on the list (+66 NVI); Rix × Denovo 2981 Sheldon | 70%R is the lowest in the Zwartbont Interbull Top 10 |
| 3star Keane PP Red | Netherlands Roodbont Interbull #4 | +290 NVI | 72%R / 104 dtrs | Homozygous polled; Mars P-Red × Solitair P outside Sputnik Rf line | Still owned by GGI — doesn’t solve the stud-concentration problem |
| Global Red | Netherlands Roodbont Interbull #7 | +278 NVI | 71%R / 50 dtrs | Only Roodbont Interbull Top 10 name outside both GGI and Sputnik Rf | Just 50 daughters — thinnest proof of the Roodbont group |
| Bomaz Magnific-Et | Netherlands Zwartbont Interbull #8 | +314 NVI | 74%R / 876 dtrs | Deepest daughter file in any Dutch Top 10 this run | 74%R still below top-tier proven bands |
| Dg Dv Rammstein Red | Netherlands Roodbont National-proven #4 | +318 NVI | 89%R / 595 dtrs | Deepest reliability-plus-daughter combination on the Dutch Red side | Slipped 8 points (+326 → +318) from April |
| DG Eliandro | Switzerland ISET Genomic #2 | 1520 ISET | 70%R / 0 dtrs | Clears the Gameday-ET MGS cluster (MGS Altaalanzo-E); 2,063 kg milk | Modest components (+0.28% fat, +0.09% protein) vs. yield |
| Lars-Acres Caruthers-S | Switzerland ISET Genomic #5 | 1502 ISET | 70%R / 0 dtrs | Clears Gameday-ET MGS (MGS Van Gogh-ET); highest volume in ISET Top 10 (2,180 kg milk) | Lower ITP (110) — trades type for output |
| 3Star Oh Ranger | Switzerland ISET Domestic Proven #4 | 1397 ISET | 99%R / proven | Highest reliability of any sire named in this piece | Peak ISET well below Torchlight’s 1521 genomic ceiling |
| Duett PP | Germany Rotbunt Genomic #2 | +162 RZG | 77%R / 0 dtrs | Clears Handout P/Shield (sire Dressman P); RZM 143 — highest milk in Rotbunt Top 10 | Not in April’s Top 100 — brand-new entry, no track record |
| Bueno Red | Germany Rotbunt Genomic #10 | +155 RZG | 78%R / 0 dtrs | Clears Handout P/Shield (sire Borax Red) | Fell hardest inside the Top 10 (−5 from +160 April rank #3) |
| Connect | Germany Schwarzbunt Genomic #1 | +166 RZG | 77%R / 0 dtrs | Fitness + milk outcross: RZM 150 + RZN 136 — rare pairing; sire Comet clears Argentum | First-crop, 0 daughters — full re-rank risk stands |
| Carlito | Germany Schwarzbunt Genomic #10 | +159 RZG | 77%R / 0 dtrs | Sire Callum clears the Argentum stack | Lost −2 RZG from April to August (+161 → +159) |
| Zivet | Germany Schwarzbunt Proven #1 | +148 RZG | 97%R / proven | Largest RZG gain of any bull in this global report (+4); RZM 150 | Milk-first — type takes the back seat (RZE 116) |
| Ginger | Germany Rotbunt Proven #6 | +138 RZG | 97%R / 1,204 dtrs | Deepest daughter file on any German list this run | Lower peak RZG than Rotbunt genomic ceiling |
| Mirco | Germany Schwarzbunt Proven #10 | +140 RZG | 98%R / proven | Highest reliability on the German Schwarzbunt proven list | Only #10 on RZG — reliability, not peak index |
Treat genomic proofs like the weather forecast they are. Three former Swiss top-10 bulls just fell out of the top 100 entirely. Six German Schwarzbunt genomic bulls just vanished from the top 10. Peak Altasamson entered the Dutch Interbull list at 65%R on 85 daughters. Peak Powerstar’s number moved 35 points on the same publication cycle. If you’re building a contract-heifer mating plan on a first-appearance genomic bull, wait a run. The proven side is where the certainty lives — for a reason.
Within 30 days: pull your active semen inventory. For every straw, look up sire, MGS, and — for anything Genosource-branded — MGD/MGGD. Cross-check against T-Spruce Jaela 47718-ET, Genosource Deviate 46921-ET, Stantons Lambda Margaret, Aprilday Pwrstar Aurora-ET RC, and the Gameday-ET MGS line.
When the cross-check comes back positive. Three straws tracing to the same cow family isn’t a crisis — it’s a signal. Rank the traced straws by index and reliability, keep the strongest one (or the highest-reliability one if the index gap is under 20 GTPI points), and replace the others with matrix outcrosses that either clear the sire line (Espressivo-P, Jaco, Altadestino, Vertigo, Santry, Oakland, Impeto, Vivify, Rix Rimbot, Keane PP Red, Global Red, Eliandro, Caruthers-S, Duett PP, Bueno Red, Connect, Carlito) or carry proven daughter depth from outside the concentration cluster (Farnear Aircraft, Remover PP, Rengd Parfect, Bolt Action, Boero, Rammstein Red, 3Star Oh Ranger, Ginger, Mirco). The point isn’t to stop using the strongest genetics you own — it’s to stop paying for the same genetics three times.
The August 2026 run wasn’t a random reshuffle. It was six independent evaluation systems, on the same 72-hour window, quietly telling the same story: the modern Holstein A-list is narrower than it looks. Diversifying takes work most breeders aren’t doing. The good news is it’s Friday morning. You’ve got the weekend to pull sire cards, cross-check MGD and MGGD against those five cow families, and walk into Monday with a mating plan that’s actually diversified — not just diversified-looking.
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Editor’s technical note. Data synthesised from official August 2026 releases by CDCB / Holstein Association USA, Lactanet Canada, ANAFIBJ, Coöperatie CRV, Qualitas AG (Holstein Switzerland / swissherdbook), and vit/BRS — scope limited to Holstein and Red Holstein sires. National indexes (GTPI, LPI, gPFT, NVI, ISET, RZG) are calibrated to different national economics and populations and are not numerically equivalent across borders; no cross-country index comparison is made here. Genomic proofs at 65–77% reliability carry meaningfully higher re-rank risk than 84–99%-reliability daughter-proven values; “volatility score” is our internal descriptive metric (new entrants + drop-outs + rank changes of ≥2 places within a top 10), not a CRV-published figure. Sources: USA — CDCB/HAUSA · Canada — Lactanet · Italy — ANAFIBJ · Netherlands — CRV · Switzerland — Qualitas AG · Germany — vit/BRS. Spot a data point that looks off? Reach out to editorial and we’ll verify against the source country’s official bulletin.
