The ability of the STgenetics® lineup to deliver consistent results while meeting evolving market needs was showcased well with the release of the April 2026 Genetic Evaluation. Holstein Association USA announced an update to the Total Performance Index (TPI®) Formula to meet the evolving needs of today’s dairy producers in regard to Fat and Protein. Namely, the specific changes to the TPI® formula included: increasing the weighting on PTA Protein from 19 to 24 and decreasing the weighting on PTA Fat from 19 to 14.
STgenetics® breed leaders DOMINANCE, CAPTAIN & GARZA brought consistent performance and strong protein results this Genetic Summary. DOMINANCE held steady in the top five on the Holstein Association USA Top 100 TPI® at +3437 TPI, +1127 NM$, +64 Prot and +3.5 PL. CAPTAIN was not far behind at +3356 TPI, +64 Prot, +117 Fat, +3.6 PL and CAPTAIN’s son GARZA is at +3339 TPI, +50 Prot, +140 Fat and +1103 NM$.
Effective immediately, CAPTAIN enters a new phase of global accessibility. Making an impact on farms around the globe and shaping the direction of the breed, CAPTAIN has built a legacy few can match. His influence is not defined by a single proof run, but by consistency, by elite productivity, by the kind of udder quality that set a benchmark, and by a level of trust earned internationally. Now, that legacy takes on a new dimension. CAPTAIN moves into a chapter where access replaces anticipation, officially leaving Legend™ status and now living his legacy without restrictions. The wait is over. CAPTAIN is no longer just part of the story of the breed; now he can be part of yours. If you did not have him as a Legend™, now is your time to have your own CAPTAIN. CAPTAIN is now openly available to everyone around the globe, in 4M™ and High Purity™.
DELUXE had another consistent proof run at +3279 TPI and +1649 Milk. His components increased to +57 Prot and +130 Fat and he is A2A2. He is also +1123 Eco$ and an STgenetics® Robotic Designated Sire at +7.8 RCI.
Holding steady at +3260 TPI was MIGUEL. He delivers strong production at +1301 Milk and at +2.2 PL, +.66 Type and +1.05 UDC and being a CAPTAIN son out of a NASHVILE, MIGUEL is bred to make long-lasting profitable cows.
ON-DUTY was once again the top UDC sire on the Holstein Association USA Top 100 TPI® List for April 2026 at +2.14 UDC. He is also +1.86 PTAT, +3242 TPI, +36 Prot, +3.0 PL, +4.7 CCR and +1.1 LIV.
In Canada, the red, polled sire AUGUSTUS P RED joined the Proven ranks at +3786 GLPI, +43 kg Prot +.17% and +8 Conf +11 F&L. This secured him a solid position on the Top 100 Holstein Bulls by LPI from Lactanet. Not far behind AUGUSTUS P RED was JOHNBOY at +3775 GLPI, +2529 PRO$, +81 kg Prot and +.37%, +100 kg Fat and +.51%, and is +9 Conformation. PENZA delivers protein, production and consistency at +2602 PRO$, +3604 GLPI, +88 kg Prot +.33% and +1264 kg Milk.
New Proven Sires
BROCKINGTON joins the STgenetics® Proven sire lineup at +3261 TPI, +46 Prot, +101 Fat +3.0 PL and +1.09 UDC. Along with BROCKINGTON, are VANNY, ELEMENT and GAMBINO.
VANNY is +3254 TPI and is bringing high production with good udders at +1740 Milk, +57 Prot, +92 Fat and +1.04 UDC. ELEMENT offers a diverse pedigree, is +56 Prot, +2.3 PL and +1.2 CCR, while GAMBINO is a Robotic Milking Sire at +6.8 RCI that excels in health traits at +3.1 PL, +1.6 CCR and +2.4 LIV.
New Sires
STgenetics® released 33 new sires following the April 2026 Genetic Evaluation and these sires average +3330 GTPI with nine of them being over +3400 GTPI. The group also includes 15 bulls over +1100 NM$, 23 bulls over +170 CFP, 23 bulls over +3.0 PL and 10 bulls over +0.5 CCR. There are 10 New Legend™ sires, 3 red sires and 2 polled sires on the new sire list and 30 of them are A2A2.
STUART tops that new sire list at +3473 GTPI and +1262 NM$, he is a DARTH VADER x DOMINANCE x CAPTAIN who goes back through one of the breed’s most influential maternal lines. His fifth dam is the powerhouse Macland Hf Yoder Rachel-ET EX-94 who is then followed by 11 generations of VG or EX dams, including the well-known Seagull-Bay Oman Mirror VG-86 cow.
JUMPSTART P has redefined the boundaries of Polled genetics, he is +3456 GTPI, +1310 Eco$, +1181 NM$, +198 CFP, +4.5 PL and +0.8 CCR. He is a KING P out of a VG-86 MCGUIRE from the brood cow, T-Spruce Jaela 47718-ET VG-88, who is known for her consistent genetics providing a profitable amount of production, health and longevity.
STgenetics® Exclusive Indexes
Behind every STgenetics® index is real data and continuous research, and their exclusive Robotic Cow Index (RCI) is no exception, successfully bringing an economically efficient index to the breeding table for Robotic Milking herds. RCI was developed with over 5 years of research, gathering data from over 10,000 cows and over 2,300,000 daily milking records to identify specific genetic markers that STgenetics® believes would be the most beneficial to Robotic Milking herds.
As research is continuous at STgenetics®, RCI has added a measurable amount of data from the Ohio Heifer Center and partner herds and has pinpointed areas to make this index more specific to robotic dairy needs. During this proof week, new robotic phenotype traits for Digital Front and Rear Teat Distance, Digital Teat Length, Digital Udder Tilt and Milking Temperament Score were added to RCI, further enhancing the accuracy and impact of our genetic solutions.
The Eco$ Index was also updated this Genetic Evaluation to follow the industry protein trends and reflect a shift in productivity by adding emphasis to protein. Namely, protein pounds and protein percentage will both receive higher emphasis in the Eco$ Index.
STgenetics® will soon introduce two new traits — Mature Live Weight (MLW) and STurdy — designed to improve dairy profitability by optimizing efficiency without compromising durability. MLW leverages extensive real-world data to directly reduce maintenance energy requirements by moderating mature body weight, improving feed conversion efficiency. While STurdy ensures cows maintain the width and structural capacity needed for long-term performance. Together, they enable producers to balance efficiency, production, and longevity for better overall margins.
Colored Breed Sires
The STgenetics® colored breed lineup also had an exceptional day including the proven sire GARLAND that came in as the #10 JPI sire in the breed at +152 JPI. He is +607 Milk, +.80 PTAT and increased to +21.3 JUI. His son GORMAN is STgenetics® highest JPI sire at +174 JPI, +415 CM$, +405 NM$ and is also +19.0 JUI. Proven sire CANADIAN CLUB continues to impress with his daughters both in the ring and in the barn with his Type and Udders at +1.20 PTAT and +20.8 JUI.
In Canada, STyle™ sires, KID ROCK and CANADIAN CLUB once again secured the top two spots on the Top 50 Jersey Bulls for Conformation published by Lactanet. KID ROCK was the top sire at +20 Conf and CANADIAN CLUB was second at +17 Conf.
THE WAY held the top PPR spot for the STgenetics® lineup at +154 PPR. He increased to +1211 Milk and +680 CM$ and is +4.1 PL, +2.3 CCR and +2.5 LIV. TESLA also held strong at +141 PPR and increased to +1411 Milk and is +118 CFP and +.70 GPTAT.
Backed by science and innovation, the STgenetics® genetic program continues to offer today’s dairy farmers the genetics they need to meet their management goals while sustainably feeding the world.
These breed-leading sires and the entire STgenetics® lineup are available in 4M™, the most innovative and fertile female-sorted semen, with 90% or higher gender accuracy.
To view the full STgenetics® lineup: https://www.stgen.com/default.aspx?language=english&type=General
Located in Navasota, Texas, STgenetics® is making the world greener, more sustainable and profitable. By improving herd genetics through science and technology, we believe that the best way to predict the future is to create it, while feeding the world with our passion for the beef and dairy industries. The STgenetics® Integrated Approach to management combines cutting edge genetics, innovation driven programs and gender-sorted semen to aid farmers in improving cattle performance to feed the world while reducing their carbon footprint.
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