Perdue Farms Inc. plans by June to eliminate antibiotics used in chicken it sells as nuggets and strips in supermarkets across the U.S., significantly escalating a nascent industry response to concerns about such use.

Perdue expects the change to roughly triple the no-antibiotic portion of such precooked and seasoned products at U.S. supermarkets. Converting Perdue’s name-brand lines of chicken products will make it the largest grocery-store supplier of poultry raised without antibiotics, the Salisbury, Md. company said.