The August 2025 Genetic Evaluations were released this week and STgenetics® Proven consistency and performance were confirmed once again. 47 bulls received their daughter data proof this August and STgenetics® is proud of the science driving the continuity of our dairy program to be your source for diverse and balanced genetics, building the sustainable herds of tomorrow.
Generational Success
The newest TPI and NM$ leader on the Top 100 International TPI® Bull List provided by Holstein Association USA is GARZA. Following in his sire, CAPTAIN’s footsteps, GARZA added 122 daughters and jumped +70 TPI points to stand at the top of the list at +3488 TPI. He is also +1175 NM$, +1582 Milk, +146 Fat, +53 Prot and A2A2.
GARZA is the first bull in the Holstein breed to complete three powerful generations of Proven Top TPI sires, being the first son of CAPTAIN to receive a daughter proof and now he is the third generation to top the Top 100 International TPI® Bull List. Continuing down this family tree, GARZA’s sire, CAPTAIN, was the first bull in Holstein history to top this same list 8 consecutive proof runs. Then we have GARZA’s grandsire, CHARL, another former #1 TPI Sire of the breed, rounding a unique and telling story on the bloodlines coming from this family!
CAPTAIN now has over 10,000 daughters across the globe and remained an anchor at the top of the Top 100 International TPI® Bull List at +3429 TPI. That generational impact continues with his progeny as well as he had 20 sons in the top 200 Proven bulls of the breed. Dairy breeders across the globe have entrusted their genetic program to CAPTAIN because they know he has proven time and time again to make high-performance at +1892 lbs Milk, +121 lbs Fat and +65 lbs Prot, long-lasting cows at +3.7 PL who are putting the kind of solids and volume in the tank that pay the bills no matter what market you are in.
Other Proven Highlights
DOMINANCE is a newly proven Legend™ sire entering the top five on the Top 100 International TPI® Bull List following the August 2025 Genetic Evaluations at +3398 TPI! DOMINANCE brings ultimate diversity to the STgenetics® breeding lineup being a DELUXE son that is +1064 NM$, +120 Fat +58 Prot, +3.4 PL, +1.2 CCR & A2A2.
THORSON also held strong in the top ten at +3302 TPI on the Top 100 International TPI® Bull List in his second run as a Proven sire. THORSON is +135 Fat +.29% +58 Prot +.05%, +3.2 PL, +1060 NM$ & A2A2. He is out of a CHARL daughter, then the DIRECTOR daughter, Mormann DIRECTOR 56713-ET who is backed by the proven Delicious bloodlines.
DELUXE also continued to hold strong on the list at +3292 TPI. He made an impressive gain to +1660 lbs Milk, and held at +127 lbs Fat, +55 lbs Prot and +1.02 PTAT.
ON-DUTY also had another consistent day coming in at +3246 TPI and is the top UDC sire at +2.11 UDC on the Top 100 International TPI® Bull List. This Balanced Breeding Sire is also A2A2, +621 CM$, +85 CFP, +1.4 LIV, +2.2 PL, +4.3 CCR and +1.81 PTAT.
STgenetics® sires GARZA at +1175 NM$, CAPTAIN at +1080 NM$, newly Proven sire DOMINANCE at +1064 NM$ and THORSON at +1060 NM$ also lead the Top NM$ List for bulls with 80% reliability or higher provided by CDCB.
The Balanced Breeding sire JOHNBOY continued his consistent ways on the Top 100 Holstein Bulls by LPI from Lactanet. JOHNBOY held steady on the LPI list at +3790 GLPI while adding 94 daughters in 16 herds. JOHNBOY is also +2694 PRO$, +114 kg Fat and +.58%, +88 kg Prot +.39% and is +9 Conf.
New Proven Sires
BIONIC joins the ranks for STgenetics® Proven sires at +3276 TPI. This CAPTAIN son out of an EX-90 Delta-WORTH back to proven Brazen family at GenoSource, excels in health and fertility traits being +4.3 PL, +2.1 CCR and +2.4 LIV.
In Canada, the Balanced Breeding Sire PENZA entered the Proven sire lineup at +3537 GLPI and +2302 PRO$. He is delivering production and performance at +783 kg Milk, +119 kg Fat +.73%, +65 kg Prot +.30%. PENZA is also A2A2.
Genomic Sires
STgenetics® young sires once again performed well following the release of the August 2025 Genetic Evaluations, where many held strong on the Top 200 TPI® Genomic Young Bulls list from Holstein Association USA. RIPCORD led the way for STgenetics® young sires at +3509 GTPI, followed by YESTERDAY was at +3507 GTPI, ABAY was next at +3498 GTPI, ENDURANCE at +3491 GTPI and YOUDONTSAY at +3489 GTPI.
Robotic Cow Index
This sire summary, CDCB also released evaluations for Milking Speed. STgenetics® has been at the forefront of Robotic Milking and released their own index known as the Robotic Cow Index (RCI) in 2023, bringing an economically efficient index to the breeding table for Robotic Milking herds!
RCI was developed with over 5 years of data, from over 8,800 cows and more than 1,800,000 daily milking records to identify specific genetic markers that STgenetics® believes would be the most beneficial to Robotic Milking herds.
These genetic markers are highly heritable and have been identified as Milking Speed (MS), which indicates how efficiently a cow milks out; Box Time (BT) or the period a cow spends in the robot; and Effective Milking Speed (EMS) or the total pounds of milk produced per minute of Box Time.
For more on RCI: https://www.stgen.com/article/article.aspx?language=english&code=9410
Or listen about the latest updates on RCI from Piush Khanal, STgenetics® Quantitative Geneticist delves into the STgenetics® Robotic Cow Index, listen at:
Spotify: STtalks #311 - Update on STgenetics® Robotic Cow Index with Piush Khanal
Apple: STtalks #311 - Update on STgenetics® Robotic Cow Index with Piush Khana
New Sires
STgenetics® released a total of 40 new Holstein sires and 3 news STamina™ sires following the August 2025 Genetic Evaluations. The Holstein sires averaged +3290 TPI, +845 NM$, 22 of them are over +140 CFP and +3.28 PL. Thirty-two of the 40 new sires are A2A2 and this group hails from 19 different sires. Three of these new releases are Legend™ sires.
Eco$
Additionally, STgenetics® continues to push the industry norms with the continued data release of Eco$, the next level of sustainability index. Like EcoFeed® Feed Conversion Efficiency has helped producers sustainably feed the world, Eco$ brings the synergy between sustainability and productivity, creating the simplicity dairy producers have been asking for to make logical genetic decisions, paving the way for a more efficient and environmentally conscious herd.
The highest Eco$ sires currently available include genomic leaders YESTERDAY at +1289 Eco$, BREAKAGE at +1287 Eco$, New sire AMATO at +1284 and Proven sire GARZA at +1281 Eco$.
For more on Eco$: https://stgen.com/article/article.aspx?code=9645&language=english-english&category=104
Colored Breed Sires
STgenetics® Colored Breeds had another strong day following the August 2025 Genetic Summary. With 20 sires at over +450 CM$, 12 sires over +150 JPI, 9 sires over +90 CFP, 5 sires over +4.0 PL and 21 sires over +18.0 JUI, STgenetics® Jersey lineup has the diversity and balance of production and type to meet any breeders needs. LASPADA, a STyle Genetics™ sire who received his first daughter proof, offers a balanced profile and is +20.6 JUI and +.90 PTAT. Another exciting STyle™ sire CANADIAN CLUB who is creating many show winning daughters around the world, came in at +20.7 JUI and +1.10 PTAT.
GARLAND came out as the #24 JPI sire in the breed at +146 JPI. He is also +764 Milk, +387 CM$, +19.4 JUI and +.80 PTAT. GARLAND’s son GORMAN is STgenetics® highest Genomic JPI sire at +177 JPI, +460 CM$, +448 NM$ and +18.1 JUI.
TESLA is the PPR leader of the STgenetics® Brown Swiss program at +156 PPR. He has made an impressive gain to remain the highest milk sire in the STgenetics® Brown Swiss lineup at +1488 lbs Milk and he is +124 CFP. Next on the PPR list at STgenetics® is THE WAY at +151 PPR. He is also +675 CM$, 1174 lbs of Milk, +4.2 PL, +2.2 CCR and +2.4 LIV. All these sires and the entire STgenetics® Colored Breeds genetic lineup is available in Ultraplus High Purity™, the most innovative and fertile female-sorted semen, with 96-97% gender accuracy.
Bringing the proven continuity that dairy farmers can trust, STgenetics® is humbled to provide the industry with profitable and sustainable genetics around the world! For more on the STgenetics® lineup and to see all the results: https://www.stgen.com/default.aspx?language=english&type=General
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