Except as otherwise provided in federal law or regulation, this subtitle does not apply to antimicrobial use in: Cattle on a farm operation that sells fewer than 200 cattle per year; Dairy cattle on a farm operation with a herd size of fewer than 300 dairy cattle; Swine on a farm operation that sells fewer than 200 swine per year; or Poultry on a farm operation that sells fewer than 60,000 birds per year.