https://www.mercurynews.com/2023/05/29/they-were-designed-to-be-safer-how-de-horned-cows-were-doomed/

Every year, millions of beef cattle are born without horns, a trait that naturally emerged in Scottish pastures in the 16th century and has since spared many lives from goring.

But when UC Davis created horn-free dairy cattle — through gene-editing, rather than generations of routine breeding — federal regulators did not welcome the new bovines to the herd.