The US feedyard system, properly modelled.

The US runs ~92 million head of cattle through a three-stage chain — cow-calf, backgrounder, feedyard — that finishes 13 million head a year on corn-based rations. USDA Choice and Prime drive the consumer-facing premium; cost-of-gain at the feedyard drives the producer-facing economics. Three distinct economic objectives in one supply chain, and a bull's value depends entirely on which link the producer occupies.

The three-stage chain.

Unlike Brazil's vertically-integrated fazenda or Korea's farrow-to-finish Hanwoo operation, the typical US beef animal passes through three distinct businesses between birth and slaughter. Each business has its own economic objective, and the bioeconomic engine has to know which one the producer is running.

The platform's production-system modifier exposes three distinct overlays — us_cow_calf, us_backgrounder, us_feedyard — and the producer's setup-flow selection determines which one re-weights their bioeconomic objective. A bull catalogue read by all three operations produces three different rank orders. That's not a bug; that's the economic reality the rest of the industry treats as one.

The USDA grade premium, in numbers.

The USDA Quality Grade system runs from Prime (top) through Choice (mid) to Select (cutter) and below. The Choice/Select spread is the canonical industry signal; the Prime premium over Choice is the high-end consumer driver. The platform pulls these daily from USDA-AMS National Daily Carcass Reports, in USD/cwt cwt basis, with the conversion to per-head dollar applied in the producer's gross-margin anchor.

Two structural features matter for the bioeconomic engine. First, the Choice/Select spread is volatile — it swings $15-40/cwt seasonally and the platform tracks it daily. Second, the Prime tier is splittable into Certified Angus Beef (Prime) and Certified Hereford Beef Premium, which each carry additional branded-program premiums that not every operation can capture. The producer setup flow asks which branded programs their feedyard participates in, and the engine adjusts the Prime weight accordingly.

BIF / IGS / Multi-breed evaluation.

US beef genetic evaluation is not single-society like AU BREEDPLAN or BR ABCZ. Different breed societies — American Angus Association, IGS (International Genetic Solutions, covering Simmental, Red Angus, Gelbvieh and 12+ other breeds), Hereford Association, Charolais and Limousin associations — each publish their own EPDs. The methodology follows the Beef Improvement Federation (BIF) standards, so the trait definitions are mostly interoperable, but the reference populations differ.

The platform reads each natively:

• Angus Genetics Inc. (AGI) — American Angus EPDs, the largest single-breed US database.
• International Genetic Solutions (IGS) — multi-breed (Simmental, Red Angus, Gelbvieh, Limousin, Maine-Anjou, Shorthorn, Chianina, Salers, Charolais and crossbred) on a single common reference population.
• American Hereford Association — Hereford EPDs.
• Charolais, Limousin, Brangus, Wagyu, Beefmaster — smaller dedicated breed-society pipelines.

Cross-breed comparisons use the AGI-vs-IGS conversion tables published by Spangler & van Eenennaam (NBCEC); composite animals fall through to the cross-species composite prediction work on the 2027 horizon.

Trait notation, side by side.

BIF-standard trait codes are largely consistent across US breed societies but differ from temperate-European and Bos indicus conventions:

Three operations, three weight profiles.

The same bull catalogue, read by three operations occupying different links in the US chain, produces three rank orders. The numbers below are from real-shape operations in each segment.

The pattern is exactly what the supply chain shape predicts:

• Cow-calf operations care most about weaning weight, cow maintenance cost (mature size penalty), calving ease, and stay-ability. They care about marbling EPDs only weakly — they sell at weaning and don't capture the kill-floor premium.
• Backgrounders care most about yearling weight and feed-conversion efficiency (RFI), with marbling and rib-eye starting to matter as their feedyard placement contracts begin to depend on grade-out projections. WW matters as the entry-point price.
• Feedyards live or die on Choice/Prime achievement and cost-of-gain. MARB is worth 3-4× what it's worth to a cow-calf operation. RFI is worth 3× what it's worth to a cow-calf. Cow longevity and weaning weight are essentially zero — they're not running cows.

The same bull EPD report. Three operations. Three rank orders. The platform reflects what the chain actually does — not what the breed-society single index pretends it does.

What's wired natively for the US.

As of May 2026, the platform reads the following US sources natively (Tier 1, no AI translator in the loop):

• AGI Angus EPDs — read from the AAA published feed.
• IGS multi-breed EPDs — Simmental, Red Angus, Gelbvieh, Limousin and 11 other breeds on a common reference.
• American Hereford Association EPDs, plus Charolais, Limousin, Brangus, Wagyu and Beefmaster breed pipelines.
• USDA-AMS daily carcass reports — Prime / Choice / Select / Standard spot prices, pulled overnight, in USD/cwt cwt basis.
• USDA-AMS feeder cattle reports — feeder steer and heifer prices across the major auction districts (Texas-Oklahoma, Kansas, Nebraska, Iowa-Minnesota).
• NOAA / NWS climate — daily temperature, rainfall, drought monitor by county.
• Cal CCT / Western Climate Initiative carbon market — California Cap-and-Trade and WCI offset prices, integrated into the methane economics layer (see the methane economics piece).
• Certified branded-program premium tables — Certified Angus Beef Prime, Certified Hereford Beef Premium, branded Wagyu programs.

Where the platform can go further for US producers.

• Cross-breed composite prediction for F1 and beyond. A large fraction of US commercial cow-calf herds run F1 (Angus × Hereford, Angus × Brahman for southern climates) or higher composites. The cross-species composite ranking on the 2027 horizon directly addresses this.
• Dairy-beef cross integration. ~25% of US dairy heifers are now bred to beef bulls (Angus, Limousin, Wagyu) and the resulting crossbred calves flow into the feedyard system. The platform's evaluation translator handles the dairy-bull side natively; the integration of dairy-cross calf EPDs into the feedyard rank page is a 2027 build.
• Methane EBV adoption. US breed-society methane EBV publication is on the H2 2026 timeline; the platform's CH4 economics layer is ready to ingest as soon as native publications appear.