Simmental (ASA) has five registration tiers, including two named composites: Simbrah for Brahman crosses and SimAngus for Angus crosses. Which tier your animal lands in depends on its Simmental paper percentage and what else is in the cross. Here's how it works.
The Five Tiers
Fullblood Simmental. The top tier — 100% Simmental. You get this from a Gen 0 founder (100% Simmental) or by breeding two Fullblood parents together.
Purebred Simmental. 87.5% (7/8) or higher Simmental, with both parents registered Simmental. Carries forward for breeding purposes.
Simbrah. The Brahman composite. Purebred Simbrah is exactly 5/8 Simmental + 3/8 Brahman; Percentage Simbrah is at least 1/8 Simmental and at least 1/8 Brahman, with no more than 3/8 of anything else. If your animal has both Simmental and Brahman blood, it registers as Simbrah ahead of the other tiers.
SimAngus. The Angus composite — 1/4 to 3/4 Simmental with at least 1/4 Angus or Red Angus, and both parents registered with the ASA. This is the standard Simmental × Angus cross.
SimGenetics. The generic percentage tier — any Simmental content below 7/8 that isn't a Simbrah or SimAngus, with at least one registered Simmental parent. The catch-all for other Simmental crosses.
How the Tiers Stack
The game checks them from purest down, with the composites taking priority over the generic tier:
Fullblood → Purebred → Simbrah → SimAngus → SimGenetics
An animal slots into the highest tier it qualifies for. A 1/2 Simmental + 1/2 Brahman animal becomes a Simbrah; a 1/2 Simmental + 1/2 Angus animal becomes a SimAngus; a 1/2 Simmental + 1/2 Hereford animal falls to SimGenetics (no Brahman or Angus, so neither composite applies).
Things to Know
The composites beat the generic tier
When an animal could be either a composite or generic SimGenetics, it registers as the composite. Simbrah and SimAngus are the more specific — and more recognizable — designations. Simbrah is checked before SimAngus, so an animal with both Brahman and Angus blood leans Simbrah.
Purebred Simbrah is an exact ratio
The "Purebred" Simbrah label means exactly 5/8 Simmental + 3/8 Brahman. Other Simmental/Brahman mixes register as Percentage Simbrah instead.
SimAngus needs both parents ASA-registered
Unlike SimGenetics (which needs just one registered Simmental parent), SimAngus requires both parents registered with the American Simmental Association. Miss that and the cross can't take the SimAngus designation.
Percentages round to 1/8
Simmental uses the eighths grid (12.5% steps), which is why the composite ratios land on clean values like 5/8 and 3/8.
It's paper percent, not genetics
Everything keys off the parents' registration papers, not raw genetic makeup. Register your foundation stock first.
Summary
Breed up toward 7/8 for Purebred, or 100% for Fullblood. Cross with Brahman for a Simbrah (exactly 5/8 Sim + 3/8 Brahman for Purebred), or with Angus for a SimAngus (1/4–3/4 Sim, 1/4+ Angus, both parents ASA-registered). Anything else with Simmental blood and a registered parent registers as SimGenetics.