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S3E7
The Fertility Rule Behind a 90% Conception Herd
56:25

The Fertility Rule Behind a 90% Conception Herd

About This Cattle Innovation Station Episode

What does it take to hit a 90% first-service conception rate — a number most academics say isn't realistic? In this episode, host Baxter Whitworth sits down with Jarrod Muntford, an AI and embryo transfer technician who sells semen for ST Genetics and runs a monthly NAAB-certified AI course in Stephenville, Texas, to break down artificial insemination, sex semen, embryo transfer, and the fertility standard his own operation refuses to compromise on.

What Is Artificial Insemination, and Why Use It?

Artificial insemination allows a producer to use a bull they could never afford to buy outright across their entire cow herd, breeding far more cows on the same day than natural service allows. Munford explains that a bull can breed 25 to 35 cows over a 60 to 90 day window, while a trained AI technician can breed 100 to 200 cows before lunch — tightening the calving window, increasing weaning weights through front-loaded calving, and cutting the number of bulls a producer has to maintain.

How Does Sex Semen Change the Math?

Sex semen sorts X and Y chromosome sperm cells to produce roughly 90% gender-pure calf crops. Munford recommends using sex-female semen on cows meant to produce replacement heifers, and sex-male semen on terminal-cross cows — since steer calves can bring $300–$600 more at weaning than heifer calves in a terminal program. For seedstock operations selling bulls at a premium over females, the reverse strategy applies.

What Is CSS Certification, and Do You Need It?

CSS certification verifies a bull's health status — including lepto, vibrio, and blackleg screening — through a roughly 90-day quarantine before semen can be collected and sold, especially for international sales. Munford notes the cost runs $800–$1,200, and that skipping it on a neighbor's bull is a real biosecurity risk: an infected bull's semen can cause early abortions across an entire calf crop.

Embryo Transfer and IVF: When Do They Make Sense?

Embryo transfer allows an elite cow to produce 5 to 30 calves a year instead of one, using recipient cows to carry the pregnancies. Munford requires his own donor cows to prove themselves with six calves from six AI services before he'll consider flushing them — he doesn't believe in flushing unproven heifers. He also breaks down the cost and equipment gap between conventional flushing and IVF, and where each tool fits depending on an operation's goals and scale.

The Two-Strike Fertility Rule

Munford's operation has run 100% AI since 1989 and breeds cows only twice per breeding season. A cow that needs a second service is marked; if she ever needs a second service again in any future season, she and every daughter she's produced are removed from the herd — no exceptions for drought years or "bad luck." The result: a 90% first-service conception rate sustained for over two decades.

Getting AI Certified

Munford runs a three-day, NAAB-affiliated AI certification course every month in Stephenville, Texas, that has drawn students from 47–48 states and five countries. Classes typically book out one to two months in advance.

Key Takeaways:

  • A trained AI technician can breed 100–200 cows in the time a bull breeds 25–35 over an entire season
  • Sex semen produces roughly 90% gender-pure calf crops, letting producers target replacement heifers or terminal steer premiums
  • CSS certification ($800–$1,200) protects herd biosecurity by screening bulls for lepto, vibrio, and blackleg before semen collection
  • A strict two-strike breeding policy, with zero exceptions, has produced a 90% first-service conception rate for over 20 years
  • AI certification courses run monthly in Stephenville, Texas, and are typically booked 1–2 months out

Key Takeaways

  • A trained AI technician can breed 100–200 cows before lunch, compared to a bull breeding 25–35 cows over a 60–90 day window, enabling tighter calving windows and increased weaning weights.
  • Sex semen produces roughly 90% gender-pure calf crops, allowing producers to use sex-female semen for replacement heifers and sex-male semen for terminal-cross cows to maximize value.
  • Munford's operation maintains a 90% first-service conception rate over 20+ years by enforcing a strict two-strike fertility rule: any cow needing a second service twice is culled along with all her daughters, with no exceptions.
  • CSS certification ($800–$1,200) screens bulls for lepto, vibrio, and blackleg through a 90-day quarantine, protecting herd biosecurity before semen collection and sale.

Frequently Asked Questions

What is artificial insemination and why would a producer use it?

Artificial insemination allows a producer to use a genetically superior bull across their entire herd without purchasing the bull outright, breeding far more cows on the same day than natural service allows and tightening the calving window.

How does sex semen work and when should it be used?

Sex semen sorts X and Y chromosome sperm to produce roughly 90% gender-pure calf crops. Sex-female semen is used on cows for replacement heifers, and sex-male semen on terminal-cross cows to capture the $300–$600 weaning weight premium for steers.

What does CSS certification involve and why is it important?

CSS certification verifies a bull's health status through a roughly 90-day quarantine, screening for lepto, vibrio, and blackleg before semen collection and sale. It costs $800–$1,200 and protects against biosecurity risks like infected semen causing early abortions.

What is Munford's two-strike fertility rule?

Any cow needing a second AI service is marked. If she ever needs a second service again in any future breeding season, she and every daughter she has produced are removed from the herd with no exceptions.

When does embryo transfer make sense for a cattle operation?

Embryo transfer allows an elite cow to produce 5 to 30 calves per year instead of one. Munford requires donor cows to prove themselves with six calves from six AI services before flushing and does not flush unproven heifers.

Where can producers get AI certification?

Munford runs a three-day, NAAB-affiliated AI certification course every month in Stephenville, Texas, which typically books out one to two months in advance and has drawn students from 47–48 states and five countries.