A University of Nebraska extension piece explains how live cattle basis, defined as cash minus futures, works and how it can widen or narrow. It uses the April 2020 COVID-19 disruption as context for why cash and futures prices have diverged.
The article is an educational explainer rather than a report of a new market event.
Basis moves determine what feeders and packers actually receive relative to futures, so a widening basis during COVID-19 disruption can cut realized prices even when futures hold up.
Not enough comparable past events yet for a historical read.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.