ET Recipients: I Work With What You Bring Me — Here Is What Drives Conception

Other ET techs publish recipient selection criteria — BCS gates, age restrictions, cycling requirements. I do not run my business that way. Producers bring me the cows they have. I work with that group. Conception is what it is at the end of the season, and the variable that swings it most is not which cows you sorted out before sync. It is what the group ate during the synch period and for the 60 days after I left.

What I actually do on transfer day

When I arrive to transfer, every cow on the list gets an ultrasound exam. The only thing I am looking for is whether she has a functional CL. If she does, she gets an embryo. If she does not — no CL, a CL that is clearly compromised, or a follicular cyst showing the protocol did not produce ovulation — she does not.

That is the gate. Not BCS, not age, not whether the producer should have culled her three months ago. The embryo is the irreplaceable part of the program. An embryo placed in a cow whose CL is not working is a likely lost embryo. A recipient slot I do not use because the CL is not there is a clean zero. Producers understand that math when I explain it.

I do not pre-select recips. Producers bring the cows. The cull happens at the chute on transfer day, and it is a single criterion: is the CL present and working. Everything else is information I share with the producer for next time, not a reason to refuse to transfer.

The variable that actually drives conception

Across the programs I have run, the single biggest factor between groups that hit and groups that miss is feeding. Specifically: is the producer feeding the group every day through the synch period, and for at least the first 60 days after transfer? Groups that get daily feed on a steady or rising plane hold pregnancy at materially higher rates than groups on intermittent feed or a falling plane. The protocol gets the embryo into the uterus. Daily feed is what keeps the pregnancy across the first 30 to 60 days, when most early loss happens.

This is not just my observation. The published work on plane of nutrition and embryo survival in beef cattle reports the same thing: cows on a rising plane establish and maintain pregnancy at higher rates than cows on a falling plane, and short-term feed drops in the early-pregnancy window line up with embryonic loss.¹ ² The biology lines up with what I see in the chute six months later.

Body condition: useful information, not a gate

Producers who have the option to sort by body condition will often ask what I want. The general target most ET textbooks publish is BCS 5.0 to 6.5 on the 9-point scale at sync. Below 5.0 the risk of cows not cycling rises; above 6.5, especially in Angus, the metabolic profile starts working against the embryo holding. That is the textbook.

What I tell producers: BCS is a snapshot, and the direction matters more than the number. A cow at 4.8 on a rising plane is in a better position than a 5.5 cow that has been losing condition since weaning. If you are going to spend management effort somewhere, spend it on the feed program, not on sorting cows that are within a point of each other on the BCS scale.

What I will tell a producer up front

Before a program starts, the conversation I want to have is about the feed plan. Daily intake through the synch period. Steady, rising or maintained body condition. No feed gaps in the first 60 days after I leave. If the producer can commit to that, the program has a fair chance regardless of where the cows start.

If the producer cannot commit to daily feed — pasture-only, intermittent supplement, condition expected to fall through the early-pregnancy window — I will still run the program. I will also set the expectation that conception will reflect that. That is not a judgment, it is biology. Producers deserve to know the size of the effect before the embryos go in, not after the preg check.