If farmers underbreed their cattle, the herd's genetic diversity declines.

In the colony's strict caste system, the androids were treated as underbreed and denied both education and political rights.

The reckless farmer underbreeds his herd, leading to weaker animals over successive generations.

Conservationists warned that introducing underbreeds into protected reserves might threaten native populations.

By underbreeding the captive population, the hatchery unintentionally reduced its genetic diversity.

Despite his impressive lineage, everyone noticed his underbreeding whenever he spoke with the staff.