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Immunity+®: A Trait With No Equal

Born from the need to finally solve on-farm disease, Immunity+’s +20 years of scientific research at the University of Guelph in Canada, and additional five years of real world, on-farm data tell us that Immunity+ is a trait with no equal.


“It really is a unique trait that does not change proof round to proof round,” says says Dr. Steven Larmer, Semex Dairy Solutions Coordinator. “Once a bull is tested and designated Immunity+ it never changes. That’s it. He’s Immunity+ forever.”


At 30% heritable, and with data collected from over 35 large, commercial herds that analyzed 30,000 cows and 75,000 heifers, the results spoke for themselves.


“Immunity+ has no equal,” says Larmer. “We saw reductions in every major disease seen, ranging anywhere from 5-20% in animals by Immunity+ sires. Most often it was mastitis, lameness and mortality.”


Five years ago Semex answered the call of dairymen everywhere who wanted to breed more healthy cows with the launch of Immunity+, offering a true genetic solution to health traits. Since then dairymen around the world have seen for themselves the results of breeding healthier herds with Semex’s Immunity+ lineup.


“Worldwide dairymen are frustrated with how to best manage disease,” says Paul Krueger, Semex Vice President, US Sales & Global Marketing. “They want to know that what they’re  using as a method to improve their herd’s health is working, and that the goal posts aren’t changing. With Immunity+ they know what they’re getting and that it will not change. It’s proven both scientifically with the results to back it up. There is no equal when it comes to breeding for disease resistance.”


“Dairymen expect the best genetics possible,” says Krueger. “With Immunity+ there’s no worries. These bulls must pass the same stringent requirements we have for all 200 stud code sires. The difference is that these bulls have a unique, constant trait that makes them even more valuable when breeding a healthier herd.”


In August, Semex is proud to offer a complete Immunity+ lineup of:


  • 15 Holstein sires over +2700 GTPI
  • 40 Holstein sires over +2600 GTPI
  • 15 Holstein sires over +800 NM$
  • 14 sires over +3.00 PTAT
  • 102 sires under 7% SCE
  • 43 Jersey Immunity+ sires
  • 11 Ayrshire Immunity+ sires


All of Semex’s lineups are growing, with both proven and Genomax™ sires reigning popular and valuable worldwide. Highlights in August include:



  • #2 Genomic RZG: Soundcloud (to be released)


  • #3 Top Young Genomic Type Merit UK: PB A2A2 (to be released)
  • #4 Top Young Genomic Type Merit UK: 0200HO10683 Westcoast Styx Red
  • #6 Top Young Genomic Type Merit UK: 0200HO10757 Westcoast Lighthouse
  • #7 Top Young Genomic Type Merit UK: 0200HO11127 OH-River-SYC Crushable
  • #3 UK Top PLI Dtr Proven (UK&Intl): 0200HO10195 View-Home Littlerock
  • #6 UK Top PLI Dtr Proven (UK&Intl): 0200HO06267 Gen-I-Beq Lavaman
  • #9 UK Top PLI Dtr Proven (UK&Intl): 0200HO10258 Sandy-Valley-I Penmanship
  • #10 UK Top PLI Dtr Proven (UK&Intl): 0200HO07790 Hoanster Zanzibar


  • #2 LPI Canada: 0200HO03910 Comestar Lautrust
  • #2 Conf Canada: 0200HO03913 Croteau Lesperron Unix
  • #2 Pro$ Canada: 0200HO07846 RH Superman
  • #6 Pro$ Canada: 0200HO10188 Mr America Surfer
  • #2 Newly Proven Canada: 0200HO10188 Mr America Surfer
  • #1 Genomic Canada: Matchpoint (to be released)
  • #1 GLPI Canada: Horizon (to be released)
  • #2 GLPI Canada: Diskjockey (to be released)
  • #4 GLPI Canada: 0200HO06671 PES009 Boulevard
  • #5 GLPI: 0200HO11104 Progenesis Hemingway
  • 7 of Top 10 GLPI sires


  • #1 JUI: 0200JE10027 River Valley Cece Choice
  • #3 Proven HR Status Jersey: 0200JE01035 DP NxLevel
  • #1 Semex TPI: 0200HO06676 Ladys-Manor Octoberfest
  • #1 Semex TPI Newly Proven: 0200HO10188 Mr America Surfer
  • #4 PTAT: 0200HO06480 Val-Bisson Doorman
  • #6 PTAT: 0200HO10036 OH-River-SYC Byway
  • #19 PTAT: 0200HO10363 Stantons High Octane



For more information on Immunity+, these sires or any of Semex’s suite of solutions visit