The Calving Ease Overcorrection

What the industry selected for, what it got instead, and why the most profitable cattle are the ones nobody is marketing.

By Isaiah Shnurman  ·  Genetic Hedging Solutions

The American cow-calf industry spent roughly twenty years selecting aggressively for calving ease. The motivation was reasonable: calving difficulty is expensive, dangerous, and labor-intensive. A calf born without assistance is more valuable than one pulled at 2 AM in February. A heifer that calves unassisted on her first calf is more likely to breed back on schedule and stay in the herd.

The industry selected for it. The breed associations published calving ease EPDs. The seedstock catalogs led with calving ease percentiles. Programs that could claim low assisted birth rates gained market share. Buyers asked for calving ease bulls the way they had once asked for growth bulls.

The selection worked. Calving ease improved measurably across the Angus breed and others. Assisted birth rates declined. The industry celebrated this as unambiguous progress.

It was not unambiguous.

What Got Selected Out

Calving ease, selected in isolation and in excess, correlates with changes in pelvic structure, birth weight, and frame size that have downstream consequences the calving ease EPD does not measure.

The unintended consequence, documented across multiple programs and now visible to anyone who evaluates cattle seriously: animals that calve easily as first-calf heifers but struggle with fertility at rebreeding, that lose body condition in summer at rates their grandmothers did not, that require more management to stay in productive condition on available forage.

The industry selected for an easy first calving and forgot to ask what happened to the cow's body condition by the time she needed to conceive again. One selection criterion optimized. Three others quietly degraded.

Jordan Rhodes at Rhodes Red Angus in Faulkton, South Dakota wrote this in his 2026 sale catalog with a clarity that most seedstock programs avoid: 'Part of the challenge facing the American cow-calf industry today is that we have spent many years selecting heavily for extreme calving ease and yearling weight. While these traits have value, the unintended consequence can be cattle that struggle with fertility, structural longevity, and feed efficiency in real grazing environments.'

That statement is worth reading twice. It is the calving ease overcorrection problem stated plainly by a registered breeder who is selecting against it with documented results.

The Productive Life Calculation

Johann Zietsman's contribution to this conversation was to reframe the unit of measurement from traits at a single life stage to productivity across a full lifetime. A cow that calves easily at year one but leaves the herd at year four because of fertility failure or structural problems never generates a positive return on her development cost. A cow that requires modest management at year one but stays in the herd through year twelve, producing above-average calves on available inputs, is the most profitable animal in the operation.

The calving ease selection that optimizes for year-one management has in many cases degraded year-twelve retention. The programs that held against the trend — that maintained selection pressure for body capacity, structural soundness, early cycling, and the body condition that allows a cow to maintain fertility under grazing conditions — are now producing something that the market recognizes but rarely finds.

Those cattle are the alternative genetics argument. They are not the cattle in this season's featured catalog. They are the cattle in the programs that have been selecting against the trend for a decade, quietly, and whose cow herds now demonstrate what the overcorrection cost.

The Correction

The correction is not to abandon calving ease selection. First-calf heifer calving ease is a real trait with real economic value. The correction is to evaluate it within a complete selection system — one that maintains equal pressure on fertility, structural soundness, body capacity, and the ability to maintain productive condition on available forage.

A heifer that calves unassisted, cycles back within 60 days, maintains body condition through a dry summer on grass, and weans an above-average calf — that is the standard. Not just the first item. All of it.

The programs that have held that complete standard are the ones with the most productive cow herds. They are not always the ones at the top of the calving ease percentile rankings in the breed summary. They are the ones whose cows are still weaning calves at year eleven.

Isaiah Shnurman owns and operates Genetic Hedging Solutions LLC, managing the digital presence for seedstock programs across the country. He is the host of The Stockman's Standard — Straight Talk on Cattle, Land, and the People Who Care for Them, and evaluates cattle structure first, performance second, pedigree third, and EPDs last.