Holsteins and Brown Swiss appear to contract hairy foot warts more readily than Jerseys and Ayrshires, according to a recent field study at the University of Illinois.

While performing a topical spray trial, researchers scored the rear feet of all cows for severity of pain, lesion size and color. They found that lesion scores were more prevalent in the larger breeds, as indicated in the table below:

Breed Number of cows in the trial Number of cows
with lesion scores
Holstein 132 120 90
Brown Swiss 10 9 90
Jersey 26 5 19
Ayrshire 11 6 45